CVE-2026-102253

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-29. The CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory

Also known asEUVD-2026-89415 (ENISA EUVD) · GHSA-jhpr-vprv-wh8f (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: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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.
Exploitation0.4% × 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
0.4%
EPSS %ILE
37th
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
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-07). 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

September 29, 2026

Last Modified

November 8, 2026

Advisory Details (3)

Auto-updated Sep 29, 2026
Patch available. Sources: github_release.
Web page

iperf3 < 3.22 UDP Receive Worker Infinite Loop DoS | Advisories | VulnCheck

https://www.vulncheck.com/advisories/iperf3-udp-receive-worker-infinite-loop-dos
Web page

iperf/RELNOTES.md at master · esnet/iperf · GitHub

https://github.com/esnet/iperf/blob/master/RELNOTES.md
GitHub release Patch Available

iperf-3.22

Patch available: esnet/iperf 3.22

https://github.com/esnet/iperf/releases/tag/3.22

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatiperf3-0:3.17.1-6.el10_2.22026-10-22redhat

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

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
iperf33.18-2 ... 3.22-0.1 (9 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
iperf33.18-2 ... 3.20-2.1 (6 versions)
  • every version up to 3.22-0.1: fixed in 3.22-0.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× 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 126 rows on record for this CVE.

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. None are among the latest 100 rows. The 26 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-11-11 16:37 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-11-10 16:41 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  4. 2026-11-09 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  5. 2026-11-08 16:37 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  6. 2026-11-08 14:07 UTCEchelonGraph re-scored
  7. 2026-11-08 14:07 UTCVendor advisory
  8. 2026-11-08 14:07 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-11-07 16:37 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  10. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-11-05 11:43 UTCEchelonGraph re-scored
  13. 2026-11-05 11:43 UTCVendor advisory
  14. 2026-11-05 11:43 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  15. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  16. 2026-11-03 16:45 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  17. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  18. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  19. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  20. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  21. 2026-10-29 21:35 UTCEchelonGraph re-scored
  22. 2026-10-29 21:35 UTCVendor advisory
  23. 2026-10-29 21:35 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  25. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
Show 75 more
  1. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  4. 2026-10-25 14:56 UTCEchelonGraph re-scored
  5. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  6. 2026-10-24 10:00 UTCEchelonGraph re-scored
  7. 2026-10-24 10:00 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  8. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-18 05:10 UTCEchelonGraph re-scored
  15. 2026-10-17 19:52 UTCEchelonGraph re-scored
  16. 2026-10-17 19:52 UTCVendor advisory
  17. 2026-10-17 19:51 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-12 16:41 UTCEchelonGraph re-scored
  24. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-10-11 21:08 UTCVendor advisory
  26. 2026-10-11 21:08 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  27. 2026-10-11 20:16 UTCEchelonGraph re-scored
  28. 2026-10-11 18:28 UTCEchelonGraph re-scored
  29. 2026-10-11 15:02 UTCEchelonGraph re-scored
  30. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  31. 2026-10-11 08:17 UTCEchelonGraph re-scored
  32. 2026-10-11 08:17 UTCVendor advisory
  33. 2026-10-11 08:16 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  34. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  35. 2026-10-10 19:24 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  36. 2026-10-10 06:28 UTCEchelonGraph re-scored
  37. 2026-10-10 06:28 UTCVendor advisory
  38. 2026-10-10 06:27 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  39. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  40. 2026-10-09 17:37 UTCVendor advisory
  41. 2026-10-09 17:37 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-10-09 04:46 UTCEchelonGraph re-scored
  43. 2026-10-09 04:46 UTCVendor advisory
  44. 2026-10-09 04:46 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  45. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  46. 2026-10-08 15:54 UTCVendor advisory
  47. 2026-10-08 15:54 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  48. 2026-10-08 01:47 UTCEchelonGraph re-scored
  49. 2026-10-08 01:47 UTCVendor advisory
  50. 2026-10-08 01:47 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  51. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  52. 2026-10-07 12:56 UTCVendor advisory
  53. 2026-10-07 12:56 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  54. 2026-10-07 00:05 UTCEchelonGraph re-scored
  55. 2026-10-07 00:05 UTCVendor advisory
  56. 2026-10-07 00:05 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  57. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  58. 2026-10-06 11:14 UTCVendor advisory
  59. 2026-10-06 11:14 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  60. 2026-10-05 22:23 UTCEchelonGraph re-scored
  61. 2026-10-05 22:23 UTCVendor advisory
  62. 2026-10-05 22:23 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  63. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  64. 2026-10-05 09:26 UTCEchelonGraph re-scored
  65. 2026-10-05 09:26 UTCVendor advisory
  66. 2026-10-05 09:26 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  68. 2026-10-04 20:35 UTCVendor advisory
  69. 2026-10-04 20:35 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-10-04 07:44 UTCVendor advisory
  71. 2026-10-04 07:44 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-10-03 18:53 UTCEchelonGraph re-scored
  73. 2026-10-03 18:53 UTCVendor advisory
  74. 2026-10-03 18:53 UTCGHSA enrichmentGHSA-jhpr-vprv-wh8f · GitHub severity HIGH · GitHub CVSS 7.5
  75. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 35th percentile

Frequently asked(5)

What is CVE-2026-102253?
CVE-2026-102253 is a high-severity vulnerability; its CVE record was published on September 29, 2026. iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram.…
When was CVE-2026-102253 made public?
CVE-2026-102253 was made public on September 29, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 29, 2026. EchelonGraph's copy of the record carries a last-modified date of November 8, 2026; the record at its source may have been updated since.
Is CVE-2026-102253 actively exploited?
CVE-2026-102253 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102253?
CVE-2026-102253 has a CVSS base score of 7.5 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-102253?
A fix for CVE-2026-102253 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102253 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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