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Vulnerability record · CVE-2003-0567 · published 18 August 2003

CVE-2003-0567: Cisco ios improper input validation vulnerability

Cisco · Ios

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.

7.8 CVSS 2.0 High EPSS 17% · top 3.1% CWE-20 · Improper input validation
7.8CVSS 2.0 base score
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.grok.org.uk/pipermail/full-disclosure/2003-July/006743.html
http://www.cert.org/advisories/CA-2003-15.html PatchThird Party AdvisoryUS Government Resource
http://www.cert.org/advisories/CA-2003-17.html ExploitPatchThird Party AdvisoryUS Government Resource
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
http://www.kb.cert.org/vuls/id/411332 US Government Resource
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5603
http://lists.grok.org.uk/pipermail/full-disclosure/2003-July/006743.html
http://www.cert.org/advisories/CA-2003-15.html PatchThird Party AdvisoryUS Government Resource
http://www.cert.org/advisories/CA-2003-17.html ExploitPatchThird Party AdvisoryUS Government Resource
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
http://www.kb.cert.org/vuls/id/411332 US Government Resource
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5603

Track CVE-2003-0567 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2003-0567), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.