CVE-2004-1464Cisco 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.
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CISA lists it as known exploited since May 19, 2023; federal agencies had to remediate by Jun 9, 2023. Treat that date as your deadline.
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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.
- CVSS
- 5.9 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400
- Known exploited
- Added to CISA KEV May 19, 2023; federal remediation due Jun 9, 2023Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 4.84% (percentile 92)
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Oct 22, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cisco ios cisco:ios | through 12.2\(15\)zj3 | NVD |
References
- https://exchange.xforce.ibmcloud.com/vulnerabilities/17131vdb-entry, x-refsource-xf, third-party-advisory
- http://securitytracker.com/id?1011079vdb-entry, x-refsource-sectrack, broken-link, third-party-advisory
- http://www.kb.cert.org/vuls/id/384230third-party-advisory, x-refsource-cert-vn, patch, us-government-resource
- http://secunia.com/advisories/12395/third-party-advisory, x-refsource-secunia, broken-link, vendor-advisory
- http://www.cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtmlvendor-advisory, x-refsource-cisco, not-applicable
- http://www.securityfocus.com/bid/11060vdb-entry, x-refsource-bid, broken-link, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2004-1464us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.