CVE-2020-17437

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 8.2Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. When the Urgent flag is set in a TCP packet, and the stack is configured to ignore the urgent data, the stack attempts to use the value of the Urgent pointer bytes to separate the Urgent data from the normal data, by calculating the offset at which the normal data should be present in the global buffer. However, the length of this offset is not checked; therefore, for large values of the Urgent pointer bytes, the data pointer can point to memory that is way beyond the data buffer in uip_process in uip.c.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
86%
KEV
Not listed

Published

December 11, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Sep 6, 2026
Patch available. Sources: cisa, cert.
cert

VU#815128 - Embedded TCP/IP stacks have memory corruption vulnerabilities

https://www.kb.cert.org/vuls/id/815128
cisa Patch Available

Multiple Embedded TCP/IP Stacks | CISA

https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
generic
https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopen-iscsi (2.0.873+git0.3b4b4500-14ubuntu3.7+esm1) @ xenial2026-05-23ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
open-iscsi—2.1.3-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
open-iscsi—2.1.3-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
open-iscsi—2.1.3-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
open-iscsi—2.1.3-1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 157 total refreshes for this CVE.

  1. 2026-09-20 20:11 UTCEPSS rescore
  2. 2026-09-19 20:03 UTCOSV refresh
  3. 2026-09-18 19:23 UTCEPSS rescore
  4. 2026-09-17 19:22 UTCEPSS rescore
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  21. 2026-09-01 03:32 UTCEPSS rescore
  22. 2026-08-31 23:34 UTCOSV refresh
  23. 2026-08-30 19:14 UTCEPSS rescore
  24. 2026-08-30 01:18 UTCEPSS rescore
  25. 2026-08-27 14:21 UTCEPSS rescore
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  1. 2026-08-26 14:42 UTCEPSS rescore
  2. 2026-08-25 13:45 UTCEPSS rescore
  3. 2026-08-21 23:45 UTCEPSS rescore
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  5. 2026-08-19 17:00 UTCEPSS rescore
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  8. 2026-08-16 14:52 UTCEPSS rescore
  9. 2026-08-16 02:11 UTCEPSS rescore
  10. 2026-08-15 01:26 UTCEPSS rescore
  11. 2026-08-15 00:24 UTCOSV refresh
  12. 2026-08-13 21:57 UTCEPSS rescore
  13. 2026-08-12 13:47 UTCEPSS rescore
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  22. 2026-08-02 02:23 UTCEPSS rescore
  23. 2026-08-01 04:12 UTCEPSS rescore
  24. 2026-07-30 16:25 UTCEPSS rescore
  25. 2026-07-30 12:44 UTCOSV refresh
  26. 2026-07-30 01:27 UTCEPSS rescore
  27. 2026-07-28 15:32 UTCEPSS rescore
  28. 2026-07-27 14:06 UTCEPSS rescore
  29. 2026-07-26 14:51 UTCEPSS rescore
  30. 2026-07-25 14:15 UTCEPSS rescore
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  35. 2026-07-23 01:50 UTCEG score recompute
  36. 2026-07-22 22:35 UTCEG score recompute
  37. 2026-07-22 14:05 UTCEPSS rescore
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  40. 2026-07-20 17:04 UTCEPSS rescore
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  42. 2026-07-19 14:28 UTCEPSS rescore
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  45. 2026-07-18 10:02 UTCEPSS rescore
  46. 2026-07-16 16:59 UTCEPSS rescore
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  48. 2026-07-15 01:57 UTCEPSS rescore
  49. 2026-07-13 22:27 UTCEPSS rescore
  50. 2026-07-13 22:27 UTCEPSS rescore
  51. 2026-07-13 06:10 UTCEPSS rescore
  52. 2026-07-13 06:10 UTCEPSS rescore
  53. 2026-07-12 22:07 UTCOSV refresh
  54. 2026-07-12 05:44 UTCEPSS rescore
  55. 2026-07-11 08:25 UTCEPSS rescore
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  57. 2026-07-09 19:07 UTCEPSS rescore
  58. 2026-07-08 15:12 UTCEPSS rescore
  59. 2026-07-07 13:43 UTCEPSS rescore
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  61. 2026-07-06 16:25 UTCEPSS rescore
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  63. 2026-07-06 02:21 UTCEPSS rescore
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  68. 2026-07-01 15:03 UTCEPSS rescore
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  73. 2026-06-28 04:54 UTCEPSS rescore
  74. 2026-06-28 04:54 UTCEPSS rescore
  75. 2026-06-27 03:06 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-17437?
CVE-2020-17437 is a high vulnerability published on December 11, 2020. An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. When the Urgent flag is set in a TCP packet, and the stack is configured to ignore the urgent data, the stack attempts to use the value of the Urgent pointer bytes to separate the Urgent data from the normal data, by…
When was CVE-2020-17437 disclosed?
CVE-2020-17437 was first published in the National Vulnerability Database on December 11, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-17437 actively exploited?
CVE-2020-17437 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 14.1% of all scored CVEs.
What is the CVSS score of CVE-2020-17437?
CVE-2020-17437 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2020-17437?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-17437, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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