CVE-2004-1464

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

In the wild

CISA lists this as exploited in real attacks. Treat as urgent.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2004-12-31 05:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2005-02-13 00:00 UTC ReservedThe CVE id was reserved by its CNA
3. 2023-05-19 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
4. 2023-06-09 Remediation deadlineCISA's due date for federal agencies to fix it
5. 2026-06-16 22:07 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
• Exploit odds: 4.8% in the next 30 days (EPSS).
• Severity: 5.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2004-12-31 05:00 UTC

Last modified

2026-06-16 22:07 UTC

Added to CISA KEV

2023-05-19

Exploit probability

4.8% · EPSS, next 30 days

Weakness

CWE-400 · Uncontrolled resource consumption

Record status

Analyzed

Affected

• Cisco iOS ≤ 12.2\(15\)zj3

Attack profile CVSS 3.1 · 5.9

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2004-1464.md and follow it. Check whether this project is affected by CVE-2004-1464. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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