CVE-2004-1464

MEDIUMNVD 5.99.0▲Exploited in the wild

5.9

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 v3: 5.9
EG Score: 9.0(high)
EPSS: 86.5%
KEV: ⚠ Exploited

Published

December 31, 2004

Last Modified

April 16, 2026

Advisory Details (5)

Auto-updated May 20, 2026

⚠️ Active exploitation confirmed. No patch confirmed yet. Sources: cert.

cert🔴 Active Exploitation

VU#384230 - Cisco IOS fails to properly handle telnet connections

http://www.kb.cert.org/vuls/id/384230

generic

http://securitytracker.com/id?1011079

generic

About Secunia Research | Flexera

http://secunia.com/advisories/12395/

generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/17131

generic

http://www.securityfocus.com/bid/11060

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 22:20 UTCkev_newly_listed
2026-05-29 13:40 UTCepss_batch
2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-27 20:35 UTCkev_newly_listed
2026-05-27 13:37 UTCepss_batch
2026-05-26 19:13 UTCkev_newly_listed
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-24 16:42 UTCepss_batch
2026-05-22 21:15 UTCepss_batch
2026-05-22 19:13 UTCkev_newly_listed
2026-05-21 22:36 UTCkev_newly_listed
2026-05-20 22:36 UTCepss_batch
2026-05-20 17:33 UTCkev_newly_listed
2026-05-20 11:20 UTCepss_batch

Frequently asked(6)

What is CVE-2004-1464?

CVE-2004-1464 is a medium vulnerability published on December 31, 2004. 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.

When was CVE-2004-1464 disclosed?

CVE-2004-1464 was first published in the National Vulnerability Database on December 31, 2004, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2004-1464 actively exploited?

Yes. CISA added CVE-2004-1464 to the Known Exploited Vulnerabilities catalog on May 19, 2023, affecting Cisco IOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2004-1464?

CVE-2004-1464 has a CVSS v3 base score of 5.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

Which products are affected by CVE-2004-1464?

CVE-2004-1464 affects Cisco IOS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2004-1464?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2004-1464, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2004-1464

📅 Published

🔄 Last Modified

📋 Advisory Details (5)

VU#384230 - Cisco IOS fails to properly handle telnet connections

About Secunia Research | Flexera

IBM X-Force Exchange

Data Freshness Timeline

❓ Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2004-1464?

Published

Last Modified

Advisory Details (5)

Frequently asked(6)