CVE-2006-4436: n/a vulnerability

CVE-2006-4436: isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA) with a repla...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 19:06 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw affects old OpenBSD isakmpd IPsec negotiation behavior. When acting as a responder, it could create security associations without replay protection, allowing a remote attacker to replay IPsec packets. The bundle does not provide CVSS scoring or evidence of active exploitation. Exposure is most likely on legacy systems running affected OpenBSD isakmpd as an IPsec responder. Modern OpenBSD deployments are unlikely to be affected, but inherited VPN gateways, embedded appliances, or old images should be checked. Prioritize if the organization still operates legacy IPsec VPN infrastructure. For current, supported systems, urgency is lower, but old VPN gateways often persist unnoticed and can undermine network trust boundaries. Mitigation focus: Apply the OpenBSD errata security fix where applicable.; Check Debian DSA-1175 if using packaged isakmpd from Debian-era systems.; Retire or isolate unsupported OpenBSD 3.8, 3.9, or earlier VPN endpoints..

Prepared: Jun 29, 2026, 10:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 29, 2006, 00:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
openbsd-isakmpd-security-bypass(28645)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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