CVE-1999-1464: n/a vulnerability

CVE-1999-1464: Vulnerability in Cisco IOS 11.1CC and 11.1CT with distributed fast switching (DFS) enabled allows remote at...

Vulnerability in Cisco IOS 11.1CC and 11.1CT with distributed fast switching (DFS) enabled allows remote attackers to bypass certain access control lists when the router switches traffic from a DFS-enabled interface to an interface that does not have DFS enabled, as described by Cisco bug CSCdk35564.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 1, 2024, 17:18 UTC (UTC+00:00)

Security readout for executives and security teams

This old Cisco IOS issue can let traffic bypass certain router access control lists under a specific distributed fast switching configuration. Business urgency depends on whether any legacy Cisco IOS 11.1CC or 11.1CT routers still enforce network boundaries. Exposure appears limited to legacy Cisco routers running IOS 11.1CC or 11.1CT with DFS enabled on relevant forwarding paths. Modern networks are unlikely to be affected unless old equipment remains in production. Treat as a legacy infrastructure exposure check, not a broad emergency. Escalate if affected routers enforce perimeter, partner, or sensitive network segmentation controls. Mitigation focus: Inventory Cisco IOS versions and identify 11.1CC or 11.1CT systems.; Review router configurations for distributed fast switching on ACL-enforced paths.; Check Cisco advisory CSCdk35564 guidance for fixed software or supported workarounds..

Prepared: Jul 1, 2026, 08:44 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: Sep 12, 2001, 04:00 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
cisco-acl-leakage(1401)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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