CVE-2004-1464Cisco IOS Denial-of-Service Vulnerability

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.

5.9 MEDIUMEPSS 4.84%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-16 22:07 UTC

OverviewCVSS details

5.9MEDIUMCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Dec 31, 2004
Assigner: mitre

Affected

ios (cisco)

Versions: through 12.2(15)zj3

Exploitation

Public exploit: None listed
CISA KEV: Listed · May 19, 2023
KEV due date: Jun 9, 2023
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact partial

EPSS · FIRST, scored Nov 8

4.84%chance of exploitation in 30 days

Higher than 92.06% of CVEs

CVSS 3.1 · NVD

5.9Medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

CVSS 2.0 · NVD

5.0Medium

AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack vector: Network
Attack complexity: Low
Authentication: None
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
5.9	MEDIUM	3.1NVD	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0	MEDIUM	2.0NVD	AV:N/AC:L/Au:N/C:N/I:N/A:P

CISA required action

⚡ Known exploited · remediation due Jun 9, 2023

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Details

CVE ID: CVE-2004-1464
Status: Analyzed
Assigner (CNA): mitre
Published: Dec 31, 2004
Last modified: 2026-06-16 22:07 UTC
Weaknesses: CWE-400

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 14:51 UTC.