How severe is CVE-2004-1464?

CVE-2004-1464 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2004-1464 being actively exploited?

Yes. CVE-2004-1464 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-05-19, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2004-1464?

CVE-2004-1464 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2004-1464?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2004-1464 have an EU (EUVD) identifier?

Yes. CVE-2004-1464 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2004-1458. It is also flagged as exploited in the EUVD (since 2023-05-19).

When was CVE-2004-1464 published?

CVE-2004-1464 was published on 2004-12-31 and last updated on 2026-06-16.

CVE-2004-1464

CVE-2004-1464 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 5.9. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-05-19). The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 5.0
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Yes — listed in CISA KEV (added 2023-05-19)
EU (EUVD) id: EUVD-2004-1458
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2023-05-19)
Weakness: CWE-400
Affected product: Cisco Ios
Published: 2004-12-31
Last modified: 2026-06-16

Description

Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.

Frequently asked questions

What is CVE-2004-1464?: Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.
How severe is CVE-2004-1464?: CVE-2004-1464 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2004-1464 being actively exploited?: Yes. CVE-2004-1464 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-05-19, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2004-1464?: CVE-2004-1464 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2004-1464?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2004-1464 have an EU (EUVD) identifier?: Yes. CVE-2004-1464 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2004-1458. It is also flagged as exploited in the EUVD (since 2023-05-19).
When was CVE-2004-1464 published?: CVE-2004-1464 was published on 2004-12-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

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