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Vulnerability record · CVE-2007-4459 · published 21 August 2007

CVE-2007-4459: Cisco voip phone cp-7940 improper input validation vulnerability

Cisco · Voip Phone Cp 7940

Cisco IP Phone 7940 and 7960 with P0S3-08-6-00 firmware, and other SIP firmware before 8.7(0), allows remote attackers to cause a denial of service (device reboot) via (1) a certain sequence of 10 invalid SIP INVITE and OPTIONS messages; or (2) a certain invalid SIP INVITE message that contains a remote tag, followed by a certain set of two related SIP OPTIONS messages.

7.1 CVSS 2.0 High EPSS 14% · top 3.6% CWE-20 · Improper input validation
7.1CVSS 2.0 base score
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
20References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

Cisco IP Phone 7940 and 7960 with P0S3-08-6-00 firmware, and other SIP firmware before 8.7(0), allows remote attackers to cause a denial of service (device reboot) via (1) a certain sequence of 10 invalid SIP INVITE and OPTIONS messages; or (2) a certain invalid SIP INVITE message that contains a remote tag, followed by a certain set of two related SIP OPTIONS messages.

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

Affected products

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

References

LinkTags
http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065401.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065402.html
http://secunia.com/advisories/26547 PatchVendor Advisory
http://securityreason.com/securityalert/3042
http://securitytracker.com/id?1018591
http://www.cisco.com/warp/public/707/cisco-sr-20070821-sip.shtml
http://www.osvdb.org/36695
http://www.securityfocus.com/bid/25378 Exploit
http://www.vupen.com/english/advisories/2007/2928 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/36125
http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065401.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065402.html
http://secunia.com/advisories/26547 PatchVendor Advisory
http://securityreason.com/securityalert/3042
http://securitytracker.com/id?1018591
http://www.cisco.com/warp/public/707/cisco-sr-20070821-sip.shtml
http://www.osvdb.org/36695
http://www.securityfocus.com/bid/25378 Exploit
http://www.vupen.com/english/advisories/2007/2928 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/36125

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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-2007-4459), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.