What is CVE-2007-4459?

CVE-2007-4459 is a vulnerability in Cisco Voip Phone Cp-7940, classified under Improper Input Validation. Published 2007-08-21.

Is CVE-2007-4459 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Cisco Voip Phone Cp-7940

CVE-2007-4459

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2007-08-21 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.1 (High). Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.140 (96.4th percentile), scored 2026-10-02.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.140 · newest: 0.140 · change: 0.000

Affected products

Cisco Voip Phone Cp-7940 — versions 3.0, 3.1, 3.2
Cisco Voip Phone Cp-7960

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.securityfocus.com/bid/25378 (Exploit, vdb-entry)
exchange.xforce.ibmcloud.com/vulnerabilities/36125 (vdb-entry)
www.cisco.com/warp/public/707/cisco-sr-20070821-sip.shtml (vendor-advisory)
secunia.com/advisories/26547 (Patch, Vendor Advisory, third-party-advisory)
lists.grok.org.uk/pipermail/full-disclosure/2007-August/065401.html (mailing-list)
securityreason.com/securityalert/3042 (third-party-advisory)
lists.grok.org.uk/pipermail/full-disclosure/2007-August/065402.html (mailing-list)
securitytracker.com/id (vdb-entry)
www.vupen.com/english/advisories/2007/2928 (vdb-entry, Vendor Advisory)
www.osvdb.org/36695 (vdb-entry)

Frequently asked questions

What is CVE-2007-4459?: CVE-2007-4459 is a vulnerability in Cisco Voip Phone Cp-7940, classified under Improper Input Validation. Published 2007-08-21.
Is CVE-2007-4459 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.