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Fencer Vulns
critical 9.8

CVE-2002-0639 in the critical feed json

Integer overflow in sshd in OpenSSH 2.9.9 through 3.3 allows remote attackers to execute arbitrary code during challenge response authentic…

published 2002-07-03 24 y ago modified 2026-06-16 4 mo ago also EUVD-2002-0633

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
18.3%
EPSS 18.3% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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.

Patch / fix

  • openssh Debian 14, Debian 13, Debian 12 1:3.4

debian advisories DEBIAN-CVE-2002-0639

Exploit prediction

18.29% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • marc.info http://marc.info/?l=bugtraq&m=102514371522793&w=2 referenced PoC, tagged "exploit" by a source, unverified
  • marc.info http://marc.info/?l=bugtraq&m=102521542826833&w=2 referenced PoC, tagged "exploit" by a source, unverified
  • marc.info http://marc.info/?l=bugtraq&m=102514631524575&w=2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.