CVE-2002-0639

Name: CVE-2002-0639
Creator: NVD / NIST
Published: 2002-07-03T04:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 18.43%

Last modified Jun 16, 2026

CVE-2002-0639 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 18.43% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

18.43%

96.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Openbsd	Openssh	>= 2.9.9, <= 3.3

References

ftp://ftp.caldera.com/pub/security/OpenLinux/CSSA-2002-030.0.txtBroken Link
http://archives.neohapsis.com/archives/bugtraq/2002-06/0335.htmlBroken Link
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000502Broken Link
http://marc.info/?l=bugtraq&m=102514371522793&w=2Exploit, Mailing List
http://marc.info/?l=bugtraq&m=102514631524575&w=2Exploit, Mailing List
http://marc.info/?l=bugtraq&m=102521542826833&w=2Exploit, Mailing List
http://www.cert.org/advisories/CA-2002-18.htmlThird Party Advisory, US Government Resource
http://www.debian.org/security/2002/dsa-134Broken Link
http://www.iss.net/security_center/static/9169.phpBroken Link
http://www.kb.cert.org/vuls/id/369347Third Party Advisory, US Government Resource
http://www.linuxsecurity.com/advisories/other_advisory-2177.htmlBroken Link
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2002:040Broken Link
http://www.osvdb.org/6245Broken Link
http://www.securityfocus.com/bid/5093Broken Link, Third Party Advisory, VDB Entry
http://www1.itrc.hp.com/service/cki/docDisplay.do?docId=HPSBUX0206-195Broken Link
https://twitter.com/RooneyMcNibNug/status/1152332585349111810Broken Link
https://web.archive.org/web/20080622172542/www.iss.net/threats/advise123.htmlThird Party Advisory
ftp://ftp.caldera.com/pub/security/OpenLinux/CSSA-2002-030.0.txtBroken Link
http://archives.neohapsis.com/archives/bugtraq/2002-06/0335.htmlBroken Link
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000502Broken Link
http://marc.info/?l=bugtraq&m=102514371522793&w=2Exploit, Mailing List
http://marc.info/?l=bugtraq&m=102514631524575&w=2Exploit, Mailing List
http://marc.info/?l=bugtraq&m=102521542826833&w=2Exploit, Mailing List
http://www.cert.org/advisories/CA-2002-18.htmlThird Party Advisory, US Government Resource
http://www.debian.org/security/2002/dsa-134Broken Link
http://www.iss.net/security_center/static/9169.phpBroken Link
http://www.kb.cert.org/vuls/id/369347Third Party Advisory, US Government Resource
http://www.linuxsecurity.com/advisories/other_advisory-2177.htmlBroken Link
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2002:040Broken Link
http://www.osvdb.org/6245Broken Link
http://www.securityfocus.com/bid/5093Broken Link, Third Party Advisory, VDB Entry
http://www1.itrc.hp.com/service/cki/docDisplay.do?docId=HPSBUX0206-195Broken Link
https://twitter.com/RooneyMcNibNug/status/1152332585349111810Broken Link
https://web.archive.org/web/20080622172542/www.iss.net/threats/advise123.htmlThird Party Advisory

Timeline

Published: Jul 3, 2002
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2002-0639?

How severe is CVE-2002-0639?

CVE-2002-0639 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 18.43% probability of exploitation in the next 30 days.

How do I fix CVE-2002-0639?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2002-0639?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST