CVE-2006-4436 json
isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA) with a replay window of size 0 when isakmpd…
published 2006-08-29 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-4424
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.8%
- EPSS 1.8% chance of exploitation in 30 days, percentile 79%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- securitytracker.com/id?1016757 patch
- securityfocus.com/bid/19712 patch
- secunia.com/advisories/21652 advisory
Exploit prediction
1.83% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
References
-
securitytracker.com
/id?1016757
vdb-entry, patch
-
secunia.com
/advisories/21652
third-party-advisory, patch, vendor-advisory
-
securityfocus.com
/bid/19712
vdb-entry, patch
-
openbsd.org
/errata38.html#isakmpd
vendor-advisory
-
debian.org
/security/2006/dsa-1175
vendor-advisory
-
openbsd.org
/errata.html#isakmpd
vendor-advisory
-
osvdb.org
/28194
vdb-entry
-
exchange.xforce.ibmcloud.com
/vulnerabilities/28645
vdb-entry
-
secunia.com
/advisories/21905
third-party-advisory
Sources
- CVE List CVE-2006-4436
- NVD CVE-2006-4436
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