CVE-2006-0905: n/a vulnerability

CVE-2006-0905: A "programming error" in fast_ipsec in FreeBSD 4.8-RELEASE through 6.1-STABLE and NetBSD 2 through 3 does n...

A "programming error" in fast_ipsec in FreeBSD 4.8-RELEASE through 6.1-STABLE and NetBSD 2 through 3 does not properly update the sequence number associated with a Security Association, which allows packets to pass sequence number checks and allows remote attackers to capture IPSec packets and conduct replay attacks.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 16:48 UTC (UTC+00:00)

Security readout for executives and security teams

This old BSD IPsec flaw can weaken VPN-style traffic protection. A sequence-number handling error may let captured IPsec packets pass replay checks, enabling replay attacks against affected FreeBSD and NetBSD systems. Business urgency is mainly for legacy network appliances, gateways, or servers still running these operating system versions with IPsec enabled. Exposure is most likely on legacy FreeBSD or NetBSD systems using fast_ipsec/IPsec, especially VPN gateways or network security devices. Modern systems are unlikely affected unless they run these historical branches or embedded derivatives. Treat as a legacy infrastructure risk. Prioritize if affected systems protect sensitive traffic, support site-to-site VPNs, or sit on critical network paths. If no affected BSD IPsec systems exist, business urgency is low. Mitigation focus: Inventory FreeBSD and NetBSD systems, including embedded appliances and legacy gateways.; Identify systems running the affected FreeBSD or NetBSD version ranges.; Determine whether fast_ipsec or IPsec is enabled on those systems..

Prepared: Jul 11, 2026, 15:14 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: Mar 23, 2006, 11:00 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
bsd-ipsec-replay(25398)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

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