CVE-2002-0639

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 33.7%, top 3% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 18%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Integer overflow in sshd in OpenSSH 2.9.9 through 3.3 allows remote attackers to execute arbitrary code during challenge response authentication (ChallengeResponseAuthentication) when OpenSSH is using SKEY or BSD_AUTH authentication.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
96.9%
KEV
Not listed

Published

July 3, 2002

Last Modified

June 16, 2026

Advisory Details (5)

Auto-updated Jun 23, 2026
No patch confirmed yet. Sources: cert.
cert

VU#369347 - OpenSSH vulnerabilities in challenge response handling

http://www.kb.cert.org/vuls/id/369347
generic

Debian -- The Universal Operating System

http://www.debian.org/security/2002/dsa-134
generic

'How to reproduce OpenSSH Overflow.' - MARC

http://marc.info/?l=bugtraq&m=102521542826833&w=2
generic

'Revised OpenSSH Security Advisory (adv.iss)' - MARC

http://marc.info/?l=bugtraq&m=102514631524575&w=2
generic

'OpenSSH Security Advisory (adv.iss)' - MARC

http://marc.info/?l=bugtraq&m=102514371522793&w=2

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 12× 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. 2026-07-20 17:02 UTCEPSS rescore
  2. 2026-07-18 09:59 UTCEPSS rescore
  3. 2026-07-16 16:58 UTCEPSS rescore
  4. 2026-07-15 16:53 UTCEPSS rescore
  5. 2026-07-15 01:55 UTCEPSS rescore
  6. 2026-07-11 08:22 UTCEPSS rescore
  7. 2026-07-07 23:12 UTCOSV refresh
  8. 2026-07-02 14:00 UTCEPSS rescore
  9. 2026-06-28 14:02 UTCEPSS rescore
  10. 2026-06-27 03:04 UTCEPSS rescore
  11. 2026-06-24 14:01 UTCEPSS rescore
  12. 2026-06-23 21:29 UTCEPSS rescore
  13. 2026-06-22 14:22 UTCEPSS rescore
  14. 2026-06-21 01:56 UTCEPSS rescore
  15. 2026-06-19 11:25 UTCOSV refresh
  16. 2026-06-18 17:49 UTCEPSS rescore
  17. 2026-06-18 17:49 UTCEPSS rescore
  18. 2026-06-17 17:49 UTCEPSS rescore
  19. 2026-06-16 17:49 UTCEPSS rescore
  20. 2026-06-14 23:13 UTCEPSS rescore
  21. 2026-06-13 22:56 UTCEPSS rescore
  22. 2026-06-12 23:07 UTCEPSS rescore
  23. 2026-06-11 13:55 UTCEPSS rescore
  24. 2026-06-10 22:13 UTCEPSS rescore
  25. 2026-06-10 13:17 UTCEPSS rescore
Show 35 more
  1. 2026-06-07 15:21 UTCEPSS rescore
  2. 2026-06-06 13:44 UTCEPSS rescore
  3. 2026-06-05 06:07 UTCEPSS rescore
  4. 2026-06-04 13:09 UTCEPSS rescore
  5. 2026-06-02 20:10 UTCEPSS rescore
  6. 2026-05-31 22:27 UTCEPSS rescore
  7. 2026-05-31 00:13 UTCEPSS rescore
  8. 2026-05-31 00:13 UTCEPSS rescore
  9. 2026-05-30 19:53 UTCOSV refresh
  10. 2026-05-29 13:40 UTCEPSS rescore
  11. 2026-05-28 13:42 UTCEPSS rescore
  12. 2026-05-28 13:42 UTCEPSS rescore
  13. 2026-05-28 13:42 UTCEPSS rescore
  14. 2026-05-28 13:42 UTCEPSS rescore
  15. 2026-05-27 13:37 UTCEPSS rescore
  16. 2026-05-27 13:37 UTCEPSS rescore
  17. 2026-05-26 07:16 UTCEPSS rescore
  18. 2026-05-26 07:16 UTCEPSS rescore
  19. 2026-05-24 16:42 UTCEPSS rescore
  20. 2026-05-22 21:15 UTCEPSS rescore
  21. 2026-05-21 22:38 UTCEPSS rescore
  22. 2026-05-20 22:36 UTCEPSS rescore
  23. 2026-05-20 11:20 UTCEPSS rescore
  24. 2026-05-20 11:20 UTCEPSS rescore
  25. 2026-05-20 08:04 UTCGHSA enrichment
  26. 2026-05-20 03:44 UTCGHSA enrichment
  27. 2026-05-19 23:26 UTCGHSA enrichment
  28. 2026-05-19 19:11 UTCGHSA enrichment
  29. 2026-05-19 14:54 UTCGHSA enrichment
  30. 2026-05-19 10:34 UTCGHSA enrichment
  31. 2026-05-19 06:16 UTCGHSA enrichment
  32. 2026-05-19 02:01 UTCEG score recompute
  33. 2026-05-19 02:01 UTCGHSA enrichment
  34. 2026-05-18 21:29 UTCEPSS rescore
  35. 2026-05-18 21:29 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2002-0639?
CVE-2002-0639 is a critical vulnerability published on July 3, 2002. Integer overflow in sshd in OpenSSH 2.9.9 through 3.3 allows remote attackers to execute arbitrary code during challenge response authentication (ChallengeResponseAuthentication) when OpenSSH is using SKEY or BSD_AUTH authentication.
When was CVE-2002-0639 disclosed?
CVE-2002-0639 was first published in the National Vulnerability Database on July 3, 2002, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2002-0639 actively exploited?
CVE-2002-0639 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2002-0639?
CVE-2002-0639 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2002-0639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2002-0639, 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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