CVE-2006-1646: n/a vulnerability

CVE-2006-1646: The Internet Key Exchange version 1 (IKEv1) implementation (isakmp_agg.c) in the Shoichi Sakane KAME Projec...

The Internet Key Exchange version 1 (IKEv1) implementation (isakmp_agg.c) in the Shoichi Sakane KAME Project racoon, as used by NetBSD 1.6, 2.x before 20060119, certain FreeBSD releases, and possibly other distributions of BSD or Linux operating systems, when running in aggressive mode, allows remote attackers to cause a denial of service (daemon crash) via crafted IKE packets, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 16, 2024, 19:40 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2006-1646 is an old remote denial-of-service issue in KAME racoon’s IKEv1 aggressive mode handling. A specially crafted IKE packet can crash the VPN key-exchange daemon, potentially interrupting IPsec VPN connectivity. The record does not indicate code execution or data theft. Most likely exposure is legacy IPsec VPN infrastructure using KAME racoon with IKEv1 aggressive mode enabled. Confirmed references name NetBSD and certain FreeBSD releases, with possible broader BSD/Linux reuse. Modern systems not using racoon, IKEv1, or aggressive mode are unlikely to be exposed. Treat as a targeted legacy VPN availability risk. Prioritize if the organization still operates racoon-based IPsec gateways exposed to the internet. Business impact is likely VPN disruption rather than compromise, but unsupported remote-access infrastructure deserves prompt review. Mitigation focus: Check the NetBSD advisory and applicable vendor guidance for fixed versions or patches.; Upgrade affected racoon/KAME-based systems to vendor-supported fixed releases.; Disable IKEv1 aggressive mode where vendor guidance and business requirements allow..

Prepared: Jul 11, 2026, 13:19 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: Apr 6, 2006, 10:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

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