CVE-2007-4459

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

14.0% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2007-08-21 21:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:44 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 14.0% in the next 30 days (EPSS).
• Severity: 7.1 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2007-08-21 21:17 UTC

Last modified

2026-06-16 22:44 UTC

Exploit probability

14.0% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Cisco Voip Phone cp-7940 ≤ 8.70
• Cisco Voip Phone cp-7940 3.0
• Cisco Voip Phone cp-7940 3.1
• Cisco Voip Phone cp-7940 3.2
• Cisco Voip Phone cp-7940 8.6
• Cisco Voip Phone cp-7960 ≤ 8.70

Attack profile CVSS 2.0 · 7.1

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

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