CVE-2003-0567

Cisco IOS 11.x and 12.0 through 12.2 allows remote attackers to cause a denial of service ...

7.8 HighPublic exploit

Cisco IOS 11.x and 12.0 through 12.2 allows remote attackers to cause a denial of service (traffic block) by sending a particular sequence of IPv4 packets to an interface on the device, causing the input queue on that interface to be marked as full.

Exploit likelihood

16.6%Up 9.8 points since Feb 4, 2022

What each source reports

NVD Score used 7.8

Record: CVE-2003-0567
CVSS 2.0: 7.8 HighAV:N/AC:L/Au:N/C:N/I:N/A:C
Weakness: CWE-20
Updated: 2026-11-02

CVE List No score

Record: CVE-2003-0567
Updated: 2026-11-02

EUVDEUVD-2003-0561 No score

Record: EUVD-2003-0561
Updated: 2026-11-03

GitHub AdvisoriesGHSA-c4c9-f467-hxxv No score

Cisco IOS 11.x and 12.0 through 12.2 allows remote attackers to cause a denial of service ...

Record: GHSA-c4c9-f467-hxxv
Weakness: CWE-20
Updated: 2026-11-02

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	Cisco IOS - IPv4 Packets Denial of Service	2003-07-18
Exploit-DB	Cisco IOS - 'cisco-bug-44020.c' IPv4 Packet Denial of Service	2003-07-21
Exploit-DB	Cisco IOS - using hping Remote Denial of Service	2003-07-22

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, Exploit-DB, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2003-0567 is a high vulnerability (CVSS 7.8) in Cisco Ios, published July 25, 2003. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 16.6%, the 97th percentile. No source names a fixed version.