CVE-2004-1464: Cisco IOS Denial-of-Service Vulnerability

CISA Known Exploited Vulnerabilities

Name

Cisco IOS Denial-of-Service Vulnerability

Vendor

Cisco

Product

IOS

Added to the catalog

2023-05-19

Due date for US federal agencies

2023-06-09

Catalog version

2026.10.30

Cisco IOS contains an unspecified vulnerability that may block further telnet, reverse telnet, Remote Shell (RSH), Secure Shell (SSH), and in some cases, Hypertext Transport Protocol (HTTP) access to the Cisco device.

Required action (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040827-telnet
• https://nvd.nist.gov/vuln/detail/CVE-2004-1464

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2004-12-31T05:00:00.000

Last modified

2026-06-16T22:07:45.380

Weaknesses

CWE-400

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.

References

• http://secunia.com/advisories/12395/ (Broken Link, Vendor Advisory)
• http://securitytracker.com/id?1011079 (Broken Link, Third Party Advisory, VDB Entry)
• http://www.cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtml (Not Applicable, Vendor Advisory)
• http://www.kb.cert.org/vuls/id/384230 (Patch, Third Party Advisory, US Government Resource)
• http://www.securityfocus.com/bid/11060 (Broken Link, Third Party Advisory, VDB Entry)
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17131 (Third Party Advisory, VDB Entry)
• http://secunia.com/advisories/12395/ (Broken Link, Vendor Advisory)
• http://securitytracker.com/id?1011079 (Broken Link, Third Party Advisory, VDB Entry)
• http://www.cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtml (Not Applicable, Vendor Advisory)
• http://www.kb.cert.org/vuls/id/384230 (Patch, Third Party Advisory, US Government Resource)
• http://www.securityfocus.com/bid/11060 (Broken Link, Third Party Advisory, VDB Entry)
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17131 (Third Party Advisory, VDB Entry)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2004-1464 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:28.906Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2004-1464

CVE record

Assigner

mitre

State

PUBLISHED

Published

2005-02-13T05:00:00.000Z

Updated

2025-10-22T00:05:57.162Z

Problem types

n/a

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.

References

• cisco-ios-telnet-dos(17131)
• 1011079
• VU#384230
• 12395
• 20040827 Cisco Telnet Denial of Service Vulnerability
• 11060

Read on 2026-11-03T00:11:44.299Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2004/1xxx/CVE-2004-1464.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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