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Servers and applications

CVE-2002-0639

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.

Severity
Critical 9.8
Published
3 Jul 2002
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
18% in the next 30 daysHigher than 97% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Integer overflow (CWE-190)
Attack
Over the network · No login needed · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSHServers and applications · cpe:a:openbsd:openssh
  • From 2.9.9 up to 3.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2002-0639
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2002-0639