OpenSSH-portable (OpenSSH) 3.6.1p1 and earlier with PAM support enabled immediately sends an error message when a user does not exist,…

Description

OpenSSH-portable (OpenSSH) 3.6.1p1 and earlier with PAM support enabled immediately sends an error message when a user does not exist, which allows remote attackers to determine valid usernames via a timing attack.

Scores

EPSS (exploitation in 30 days)

76.8% · top 0.5% of all CVEs (2 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.

Weakness

• n/a
• CWE-203 (opens in a new tab)

Affected products

• n/a

  • affected n/a

References (10)

• RHSA-2003:222 (opens in a new tab)vendor-advisoryx_transferred
• 20030430 OpenSSH/PAM timing attack allows remote users identification (opens in a new tab)mailing-listx_transferred
• 7467 (opens in a new tab)vdb-entryx_transferred
• 20030806 [OpenPKG-SA-2003.035] OpenPKG Security Advisory (openssh) (opens in a new tab)mailing-listx_transferred
• RHSA-2003:224 (opens in a new tab)vendor-advisoryx_transferred
• oval:org.mitre.oval:def:445 (opens in a new tab)vdb-entrysignaturex_transferred
• http://lab.mediaservice.net/advisory/2003-01-openssh.txt (opens in a new tab)x_transferred
• TLSA-2003-31 (opens in a new tab)vendor-advisoryx_transferred
• 20030430 OpenSSH/PAM timing attack allows remote users identification (opens in a new tab)mailing-listx_transferred
• https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf (opens in a new tab)x_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Record last updated 8 Aug 2024, 01:43 UTC.