CVE-2003-0567

Severity: high (CVSS 7.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 16.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2003-08-18 · updated 2026-06-16
Weakness: CWE-20

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.

Affected products

Cisco IOS: 11.0, 11.1, 11.1aa, 11.1ca, 11.1cc, 11.2 (+163)
Cisco Ons 15454 Optical Transport Platform: all versions
Cisco Optical Networking Systems Software: 3.0, 3.1.0, 3.2.0, 3.3.0, 3.4.0, 4.0.0

References

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

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