How severe is CVE-1999-1464?

CVE-1999-1464 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-1999-1464 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1464?

CVE-1999-1464 primarily affects Cisco Ios. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-1464?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-1999-1464 published?

CVE-1999-1464 was published on 1999-12-31 and last updated on 2026-06-16.

CVE-1999-1464

CVE-1999-1464 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Ios
Published: 1999-12-31
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-1999-1464?: 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.
How severe is CVE-1999-1464?: CVE-1999-1464 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-1999-1464 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1464?: CVE-1999-1464 primarily affects Cisco Ios. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1464?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-1999-1464 published?: CVE-1999-1464 was published on 1999-12-31 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:cisco:ios:11.1cc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1ct:*:*:*:*:*:*:*

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