CVE-2006-4436

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2006-08-29 · updated 2026-06-16

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.

Affected products

OpenBSD: 3.8, 3.9

References

http://secunia.com/advisories/21652
http://secunia.com/advisories/21905
http://securitytracker.com/id?1016757
http://www.debian.org/security/2006/dsa-1175
http://www.openbsd.org/errata.html#isakmpd
http://www.openbsd.org/errata38.html#isakmpd
http://www.osvdb.org/28194
http://www.securityfocus.com/bid/19712
https://exchange.xforce.ibmcloud.com/vulnerabilities/28645
http://secunia.com/advisories/21652
http://secunia.com/advisories/21905
http://securitytracker.com/id?1016757

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