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CVE-2004-1464

Cisco IOS Denial-of-Service

5.9 MEDIUMActively exploited (CISA KEV)EPSS 4.84%
  1. Published31 Dec 2004
  2. Added to CISA KEV19 May 2023
  3. Remediation due9 Jun 2023
Actively exploited (CISA KEV)

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.

Added to KEV: 19 May 2023Federal remediation due: 9 Jun 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Cisco iOS≤ 12.2\(15\)zj3

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2004-1464 being actively exploited?

Yes. CVE-2004-1464 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 19 May 2023.

How severe is CVE-2004-1464?

CVE-2004-1464 has a CVSS 3.1 base score of 5.9, rated medium. EPSS estimates a 4.84% probability of exploitation.

Which products are affected by CVE-2004-1464?

Affected products include Cisco iOS.

How do I fix CVE-2004-1464?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2004-1464 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.