CVE-2006-4436
isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA)...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2006-4436- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2006-4436- Updated
- 2026-11-02
EUVDEUVD-2006-4424 No score
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.
- Record
EUVD-2006-4424- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8rrj-gp2f-j85m No score
isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA)...
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.
- Record
GHSA-8rrj-gp2f-j85m- Updated
- 2026-11-02
OSV No score
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.
- Record
CVE-2006-4436- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
isakmpdDebian:3.1 |
before 20041012-1sarge1, plus listed versions 20041012-1 |
20041012-1sarge1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2006-4436 is a medium vulnerability (CVSS 5.0) in Openbsd, published August 29, 2006. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.83%, the 79th percentile. Fixed in isakmpd 20041012-1sarge1.