What is CVE-2004-1464?

CVE-2004-1464 is a medium-severity vulnerability in Cisco iOS, classified under Uncontrolled Resource Consumption. CVSS score: 5.9/10. Published 2004-12-31.

How severe is CVE-2004-1464?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2004-1464 known to be exploited?

Yes. CVE-2004-1464 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-05-19), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Resource exhaustion in Cisco iOS

CVE-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.

Vulnerability class: DoS (Denial of Service)

Published 2004-12-31 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.048 (91.9th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.048 · newest: 0.048 · change: 0.000

Affected products

Cisco iOS

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-05-19. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-06-09.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

exchange.xforce.ibmcloud.com/vulnerabilities/17131 (VDB Entry, Third Party Advisory, vdb-entry)
securitytracker.com/id (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www.kb.cert.org/vuls/id/384230 (US Government Resource, Patch, Third Party Advisory, third-party-advisory)
secunia.com/advisories/12395/ (Broken Link, Vendor Advisory, third-party-advisory)
www.cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtml (vendor-advisory, Not Applicable, Vendor Advisory)
www.securityfocus.com/bid/11060 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2004-1464?: CVE-2004-1464 is a medium-severity vulnerability in Cisco iOS, classified under Uncontrolled Resource Consumption. CVSS score: 5.9/10. Published 2004-12-31.
How severe is CVE-2004-1464?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2004-1464 known to be exploited?: Yes. CVE-2004-1464 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-05-19), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.