isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA) with a replay window of size 0 when isakmpd…

Description

isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA) with a replay window of size 0 when isakmpd acts as a responder during SA negotiation, which allows remote attackers to replay IPSec packets and bypass the replay protection.

Scores

EPSS (exploitation in 30 days)

1.8% · top 21% of all CVEs (6 Nov 2026)

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

Weakness

• n/a

Affected products

• n/a

  • affected n/a

References (9)

• [3.8] 20060825 013: SECURITY FIX: August 25, 2006 (opens in a new tab)vendor-advisoryx_refsource_OPENBSDx_transferred
• 28194 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
• openbsd-isakmpd-security-bypass(28645) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
• 1016757 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
• 21652 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• DSA-1175 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• 19712 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• 21905 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• [3.9] 20060825 008: SECURITY FIX: August 25, 2006 (opens in a new tab)vendor-advisoryx_refsource_OPENBSDx_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)

Badge for a README or a ticket

[![CVE-2006-4436](https://trackcve.app/badge/CVE-2006-4436.svg)](https://trackcve.app/cve/CVE-2006-4436)

Record last updated 7 Aug 2024, 19:06 UTC.