CVE-2026-102253

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

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: cna:vulncheck, epss, ghsa
Trending — 5 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • 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
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
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
35th
KEV
Not listed

CISA SSVCTrack 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). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

October 1, 2026

Advisory Details (3)

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

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

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

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

Vendor Advisories for CVE-2026-102253(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 32× in last 7d / 32× 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.

  1. 2026-10-04 07:44 UTCVendor advisory
  2. 2026-10-04 07:44 UTCGHSA enrichment
  3. 2026-10-03 18:53 UTCEG score recompute
  4. 2026-10-03 18:53 UTCVendor advisory
  5. 2026-10-03 18:53 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-03 06:02 UTCVendor advisory
  8. 2026-10-03 06:02 UTCGHSA enrichment
  9. 2026-10-02 17:11 UTCEG score recompute
  10. 2026-10-02 17:11 UTCVendor advisory
  11. 2026-10-02 17:10 UTCGHSA enrichment
  12. 2026-10-02 04:19 UTCEG score recompute
  13. 2026-10-02 04:19 UTCVendor advisory
  14. 2026-10-02 04:19 UTCGHSA enrichment
  15. 2026-10-01 19:49 UTCEPSS rescore
  16. 2026-10-01 15:26 UTCEG score recompute
  17. 2026-10-01 15:26 UTCVendor advisory
  18. 2026-10-01 15:26 UTCGHSA enrichment
  19. 2026-10-01 09:14 UTCVendor advisory
  20. 2026-10-01 09:14 UTCGHSA enrichment
  21. 2026-09-30 20:23 UTCEG score recompute
  22. 2026-09-30 20:23 UTCGHSA enrichment
  23. 2026-09-30 19:36 UTCEG score recompute
  24. 2026-09-30 19:36 UTCGHSA enrichment
  25. 2026-09-30 17:26 UTCEG score recompute
Show 7 more
  1. 2026-09-30 17:26 UTCGHSA enrichment
  2. 2026-09-30 15:02 UTCEPSS rescore
  3. 2026-09-30 10:12 UTCEG score recompute
  4. 2026-09-30 10:12 UTCGHSA enrichment
  5. 2026-09-29 21:21 UTCEG score recompute
  6. 2026-09-29 20:29 UTCEG score recompute
  7. 2026-09-29 20:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-102253?
CVE-2026-102253 is a high vulnerability 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 disclosed?
CVE-2026-102253 was first published on September 29, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
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 (35th 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.

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