CVE-2004-1464
Cisco IOS Denial-of-Service Vulnerability
- Medium 5.9
- Exploited: added to CISA KEV 19 May 2023
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.
Key facts
- Published
- 13 Feb 2005
- Last changed
- 22 Oct 2025
- Assigned by
- mitre
- KEV added
- 19 May 2023
- KEV fix due
- 9 Jun 2023
- EPSS
- 4.801% likely to be exploited in the next 30 days, higher than 92.091% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: partial
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 5.9CVSS 3.1, Mediumfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 13 Feb 2005 Published
- 19 May 2023 CVE-2004-1464 added to CISA KEV
- 19 May 2023 Added to the CISA KEV catalogue