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Vulnerability record · CVE-2007-4430 · published 20 August 2007

CVE-2007-4430: Cisco cli improper input validation vulnerability

Cisco · Cli

Unspecified vulnerability in Cisco IOS 12.0 through 12.4 allows context-dependent attackers to cause a denial of service (device restart and BGP routing table rebuild) via certain regular expressions in a "show ip bgp regexp" command. NOTE: unauthenticated remote attacks are possible in environments with anonymous telnet and Looking Glass access.

5.0 CVSS 2.0 Medium EPSS 13% · top 3.7% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
18References
16 Jun 2026Last modified by NVD

Description

Unspecified vulnerability in Cisco IOS 12.0 through 12.4 allows context-dependent attackers to cause a denial of service (device restart and BGP routing table rebuild) via certain regular expressions in a "show ip bgp regexp" command. NOTE: unauthenticated remote attacks are possible in environments with anonymous telnet and Looking Glass access.

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

Affected products

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

References

LinkTags
http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=WAN%2C%20Routing%20and%2
http://secunia.com/advisories/26798 Vendor Advisory
http://www.cisco.com/en/US/products/products_security_response09186a00808bb91c.html
http://www.heise-security.co.uk/news/94526/
http://www.securityfocus.com/bid/25352
http://www.securitytracker.com/id?1018685
http://www.vupen.com/english/advisories/2007/3136 Vendor Advisory
https://puck.nether.net/pipermail/cisco-nsp/2007-August/043002.html
https://puck.nether.net/pipermail/cisco-nsp/2007-August/043010.html
http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=WAN%2C%20Routing%20and%2
http://secunia.com/advisories/26798 Vendor Advisory
http://www.cisco.com/en/US/products/products_security_response09186a00808bb91c.html
http://www.heise-security.co.uk/news/94526/
http://www.securityfocus.com/bid/25352
http://www.securitytracker.com/id?1018685
http://www.vupen.com/english/advisories/2007/3136 Vendor Advisory
https://puck.nether.net/pipermail/cisco-nsp/2007-August/043002.html
https://puck.nether.net/pipermail/cisco-nsp/2007-August/043010.html

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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-2007-4430), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.