CVE-2020-35498

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2020-23167 (ENISA EUVD) · GHSA-9978-p96m-85pj (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 8.0%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
52
EG Risk 52/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation8.0% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
8.0%
EPSS %ILE
94th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
8.0% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-09). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 11, 2021

Last Modified

April 23, 2025

Advisory Details (6)

Auto-updated Nov 3, 2026
Patch available. Sources: redhat.
Web page

Open vSwitch: Multiple Vulnerabilities (GLSA 202311-16) — Gentoo security

https://security.gentoo.org/glsa/202311-16
Web page

[SECURITY] Fedora 33 Update: dpdk-20.11-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR/
Web pageMentions a patch (unverified)

[SECURITY] [DLA 2571-1] openvswitch security update

https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html
Red HatMentions a patch (unverified)

1908845 – (CVE-2020-35498) CVE-2020-35498 openvswitch: limitation in the OVS packet parsing in userspace leads to DoS

Affected: Red Hat Enterprise Linux 8

https://bugzilla.redhat.com/show_bug.cgi?id=1908845
Web page

oss-security - CVE-2020-35498: Open vSwitch: Packet parsing vulnerability

https://www.openwall.com/lists/oss-security/2021/02/10/4
Web page

[SECURITY] [DSA 4852-1] openvswitch security update

https://www.debian.org/security/2021/dsa-4852

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython-openvswitch (2.5.9-0ubuntu0.16.04.3) @ xenial2026-10-28ubuntu
redhatopenvswitch2.11-0:2.11.3-86.el7fdp2021-06-16redhat
redhatopenvswitch-0:2.9.9-1.el7fdp2021-05-20redhat
redhatovn2.11-0:2.11.1-57.el7fdp2021-03-31redhat
redhatopenvswitch2.13-0:2.13.0-81.el7fdp2021-03-15redhat
redhatopenvswitch2.11-0:2.11.3-83.el8fdp2021-03-15redhat
redhatopenvswitch2.13-0:2.13.0-79.5.el8fdp2021-02-11redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(18 across 18 ecosystems)
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • 2.5.0 up to 2.12.3-r0: fixed in 2.12.3-r0
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch2.10.0+2018.08.28+git.8ca7c82b7d+ds1-12, 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-12+deb10u1, 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-12+deb10u2, 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-13, 2.10.6+ds1-0+deb10u1
  • every version up to 2.10.7+ds1-0+deb10u1: fixed in 2.10.7+ds1-0+deb10u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • every version up to 2.15.0~git20210104.def6eb1ea+dfsg1-5: fixed in 2.15.0~git20210104.def6eb1ea+dfsg1-5
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • every version up to 2.15.0~git20210104.def6eb1ea+dfsg1-5: fixed in 2.15.0~git20210104.def6eb1ea+dfsg1-5
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • every version up to 2.15.0~git20210104.def6eb1ea+dfsg1-5: fixed in 2.15.0~git20210104.def6eb1ea+dfsg1-5
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • every version up to 2.15.0~git20210104.def6eb1ea+dfsg1-5: fixed in 2.15.0~git20210104.def6eb1ea+dfsg1-5
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch2.6.2~pre+git20161223-3
  • every version up to 2.6.10-0+deb9u1: fixed in 2.6.10-0+deb9u1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 39× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 209 rows on record for this CVE, as 99 entries (1 repeat merged).

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 109 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:39 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  2. 2026-11-12 16:29 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  3. 2026-11-12 08:56 UTCOSV refresh
  4. 2026-11-11 16:31 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  5. 2026-11-10 16:34 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  6. 2026-11-10 08:17 UTCEchelonGraph re-scored
  7. 2026-11-10 08:17 UTCVendor advisory
  8. 2026-11-10 08:17 UTCGHSA enrichmentGHSA-9978-p96m-85pj · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-11-09 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  10. 2026-11-08 16:32 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  11. 2026-11-07 16:33 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  12. 2026-11-06 16:29 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  13. 2026-11-05 16:30 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  14. 2026-11-04 16:29 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  15. 2026-11-03 20:31 UTCEchelonGraph re-scored
  16. 2026-11-03 20:31 UTCVendor advisory
  17. 2026-11-03 20:31 UTCGHSA enrichmentGHSA-9978-p96m-85pj · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-11-03 16:36 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  19. 2026-11-02 16:36 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  20. 2026-11-01 16:29 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  21. 2026-10-31 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  22. 2026-10-30 16:29 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  23. 2026-10-29 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  24. 2026-10-28 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  25. 2026-10-28 06:39 UTCEchelonGraph re-scored
Show 74 more
  1. 2026-10-28 06:39 UTCVendor advisory
  2. 2026-10-28 06:39 UTCGHSA enrichmentGHSA-9978-p96m-85pj · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-10-27 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  4. 2026-10-26 16:27 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  5. 2026-10-25 18:43 UTCEchelonGraph re-scored
  6. 2026-10-25 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  7. 2026-10-24 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  8. 2026-10-23 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  9. 2026-10-22 16:29 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  10. 2026-10-21 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  11. 2026-10-21 11:53 UTCEchelonGraph re-scored
  12. 2026-10-21 11:53 UTCVendor advisory
  13. 2026-10-21 11:53 UTCGHSA enrichmentGHSA-9978-p96m-85pj · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-20 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  15. 2026-10-19 16:27 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  16. 2026-10-19 01:55 UTCOSV refresh
  17. 2026-10-18 09:23 UTCEchelonGraph re-scored
  18. 2026-10-17 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  19. 2026-10-16 16:33 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  20. 2026-10-15 16:27 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  21. 2026-10-14 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  22. 2026-10-13 16:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  23. 2026-10-12 19:36 UTCEchelonGraph re-scored
  24. 2026-10-12 16:29 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  25. 2026-10-12 00:00 UTCEchelonGraph re-scored
  26. 2026-10-11 13:43 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  27. 2026-10-10 19:56 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  28. 2026-10-09 20:04 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  29. 2026-10-08 16:38 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  30. 2026-10-07 23:44 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  31. 2026-10-06 15:13 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  32. 2026-10-05 17:39 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  33. 2026-10-04 23:18 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  34. 2026-10-03 14:22 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  35. 2026-09-30 15:18 UTCEchelonGraph re-scored
  36. 2026-09-30 14:59 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  37. 2026-09-29 15:14 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  38. 2026-09-27 13:41 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  39. 2026-09-26 15:54 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  40. 2026-09-26 09:55 UTCOSV refresh
  41. 2026-09-24 14:00 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  42. 2026-09-22 14:43 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  43. 2026-09-21 20:28 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  44. 2026-09-19 15:37 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  45. 2026-09-18 19:23 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  46. 2026-09-17 19:22 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  47. 2026-09-16 14:04 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  48. 2026-09-15 03:06 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  49. 2026-09-13 16:43 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  50. 2026-09-12 14:57 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  51. 2026-09-11 09:32 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  52. 2026-09-08 21:56 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  53. 2026-09-07 15:57 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  54. 2026-09-06 22:31 UTCOSV refresh
  55. 2026-09-06 13:44 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  56. 2026-09-05 15:24 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  57. 2026-09-04 13:57 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  58. 2026-09-04 05:03 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  59. 2026-09-02 14:08 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  60. 2026-09-01 03:32 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  61. 2026-08-30 19:14 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  62. 2026-08-30 01:18 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  63. 2026-08-27 14:21 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  64. 2026-08-26 14:42 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  65. 2026-08-25 13:45 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  66. 2026-08-21 23:45 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  67. 2026-08-20 22:52 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  68. 2026-08-20 08:31 UTCOSV refresh
  69. 2026-08-19 17:00 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  70. 2026-08-18 13:44 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  71. 2026-08-17 13:43 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  72. 2026-08-16 14:52 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  73. 2026-08-16 02:11 UTCEPSS rescoreEPSS 8.0% · 94th percentile
  74. 2026-08-15 01:26 UTCEPSS rescoreEPSS 8.0% · 94th percentile

Frequently asked(5)

What is CVE-2020-35498?
CVE-2020-35498 is a high-severity vulnerability; its CVE record was published on February 11, 2021. A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this…
When was the CVE record for CVE-2020-35498 published?
The CVE record for CVE-2020-35498 was published on February 11, 2021. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 23, 2025; the record at its source may have been updated since.
Is CVE-2020-35498 actively exploited?
CVE-2020-35498 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 8.0% probability of exploitation in the next 30 days (94th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-35498?
CVE-2020-35498 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2020-35498?
A fix for CVE-2020-35498 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-35498 are linked in the Vendor Advisories panel on this page.

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