CVE-2006-4436
MEDIUM · CVSS 5.0EPSS 1.8%EU EUVD
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.
Key facts
- CVSS score
- 5.0 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:L/Au:N/C:P/I:N/A:N- EPSS score
- 1.8% (79th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2006-4424)
- Published
- August 29, 2006
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2006-4424 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- openbsd / openbsd
- openbsd / openbsd
References
- http://secunia.com/advisories/21652(Patch, Vendor Advisory)
- http://secunia.com/advisories/21905
- http://securitytracker.com/id?1016757(Patch)
- 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(Patch)
- https://exchange.xforce.ibmcloud.com/vulnerabilities/28645
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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