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Vulnerabilities

Vulnerability · CVE-2004-1464

Cisco IOS Denial-of-Service Vulnerability

Published Dec 30, 2004 · catalog updated Jun 16, 2026 · Cisco IOS

Patch now

CVE-2004-1464 is in the CISA known-exploited catalog, due Jun 9, 2023. Confirm Cisco IOS against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Medium5.9
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
4.84%
Remediation
Remediation guidance
Affected products
cpe cisco/ios · vendor Cisco IOS · vendor n/a n/a

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/iosversion unspecified
  • vendor Cisco IOSversion unspecified
  • vendor n/a n/aversion unspecified

How to fix CVE-2004-1464

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2004-1464 is in the CISA known-exploited catalog, due Jun 9, 2023. Confirm Cisco IOS against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption. EPSS 4.84%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 30, 2004 · Catalog

    Detected

    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.

  2. May 19, 2023 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Jun 9, 2023 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2004-1464

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-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.

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2004-1464

    30-day exploitation probability 4.8%

    first.org
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2004-1464

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.