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Fencer Vulns
critical 10.0

CVE-2002-0640 in the critical feed json

Buffer overflow in sshd in OpenSSH 2.3.1 through 3.3 may allow remote attackers to execute arbitrary code via a large number of responses d…

published 2002-07-03 24 y ago modified 2026-06-16 4 mo ago also EUVD-2002-0634

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
28.2%
EPSS 28.2% chance of exploitation in 30 days, percentile 98%
public exploits
2
Exploit-DB

Summary

Buffer overflow in sshd in OpenSSH 2.3.1 through 3.3 may allow remote attackers to execute arbitrary code via a large number of responses during challenge response authentication when OpenBSD is using PAM modules with interactive keyboard authentication (PAMAuthenticationViaKbdInt).

Patch / fix

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

debian advisories DEBIAN-CVE-2002-0640

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2002-0640 updated

security flaw

  • Red Hat Linux 7.0 Red Hat Linux 7.1 Red Hat Linux 7.2 Red Hat Linux 7.3
    fixed: vendor fix RHSA-2002:127

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-21579)
  2. Published

Exploit prediction

28.16% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-21579 OpenSSH 3.x - Challenge-Response Buffer Overflow (2) remote, 2002-06-24
  • EDB-21578 OpenSSH 3.x - Challenge-Response Buffer Overflow (1) remote, 2002-06-24

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

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.