CVE-2007-4459

highpriority · track · 43EPSS 0.140 · 97 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · functional

Likely / severe?

14.0% (97th) EPSS

CVSS 7.1 · high

Is it mine?

7 products

Check your exposure

Who says so?

2 sources

enisa_euvd · nvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.4–7.1

v2.07.1highAV:N/AC:M/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 8.6 · impact 6.9

v2.06.4mediumAV:N/AC:M/Au:N/C:N/I:N/A:C/E:POCsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimary

exploits (2)

Public proof-of-concept and weaponised exploit code.

EDB-4297Cisco IP Phone 7940 - 3 SIP Messages Remote Denial of Servicefunctional · exploit_db
EDB-4298Cisco IP Phone 7940 - 10 SIP Messages Remote Denial of Servicefunctional · exploit_db

affected products (7)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
cisco voip phone cp-7940≤ 8.70nvdUScpe:2.3:h:cisco:voip_phone_cp-7940:*:*:*:*:*:*:*:*
cisco voip phone cp-7940= 3.0nvdUScpe:2.3:h:cisco:voip_phone_cp-7940:*:*:*:*:*:*:*:*
cisco voip phone cp-7940= 3.1nvdUScpe:2.3:h:cisco:voip_phone_cp-7940:*:*:*:*:*:*:*:*
cisco voip phone cp-7940= 3.2nvdUScpe:2.3:h:cisco:voip_phone_cp-7940:*:*:*:*:*:*:*:*
cisco voip phone cp-7940= 8.6nvdUScpe:2.3:h:cisco:voip_phone_cp-7940:*:*:*:*:*:*:*:*
cisco voip phone cp-7960≤ 8.70nvdUScpe:2.3:h:cisco:voip_phone_cp-7960:*:*:*:*:*:*:*:*

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd nvd NVD CVE.org MITRE

published 2007-08-21modified 2026-06-16

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+25201 more

references (20)

External citations — patches, advisories, analysis.

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