CVE-2006-3906: n/a vulnerability

CVE-2006-3906: Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PI...

Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of IKE Phase-1 packets that exceed the session expiration rate. NOTE: it has been argued that this is due to a design weakness of the IKE version 1 protocol, in which case other vendors and implementations would also be affected.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 18:48 UTC (UTC+00:00)

Security readout for executives and security teams

This CVE describes a denial-of-service risk against IKEv1 VPN handling. A flood of IKE Phase-1 packets can consume resources faster than sessions expire, potentially disrupting VPN availability. The record names Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, while noting the weakness may be broader to IKEv1 designs. Most relevant to organizations still running internet-facing or partner-facing IKEv1 VPN endpoints, especially legacy Cisco IOS, VPN 3000 Concentrators, or PIX firewalls. Exposure is lower where IKEv1 is disabled, unavailable from untrusted networks, or legacy Cisco VPN platforms have been retired. Treat this as a legacy VPN availability risk. It is not described as data theft or code execution, but VPN disruption can affect remote access and site connectivity. Prioritize if exposed IKEv1 endpoints remain active or if legacy Cisco VPN infrastructure is still operational. Mitigation focus: Inventory internet-facing and partner-facing IKEv1 VPN endpoints.; Check Cisco and current vendor guidance for affected versions and supported fixes.; Disable IKEv1 where business requirements allow..

Prepared: Jun 29, 2026, 11:25 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: Jul 27, 2006, 22:00 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

3Source 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
oval:org.mitre.oval:def:5299CVE reference · vdb-entry, signature
cisco-ike-resource-exhaustion-dos(27972)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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