CVE-2002-0640

CVE-2002-0640 is a critical-severity vulnerability in Openbsd Openssh with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 27% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

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).

Frequently asked questions

What is CVE-2002-0640?
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).
How severe is CVE-2002-0640?
CVE-2002-0640 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2002-0640 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 27% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2002-0640?
CVE-2002-0640 primarily affects Openbsd Openssh. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2002-0640?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2002-0640 published?
CVE-2002-0640 was published on 2002-07-03 and last updated on 2026-06-16.

References

Affected products (26)

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