VulnerabilityModified

CVE-2016-7551

chain_sip in Asterisk Open Source 11.x before 11.23.1 and 13.x 13.11.1 and Certified Asterisk 11.6 before 11.6-cert15 and 13.8 before 13.8-cert3 allows remote attackers to cause a denial of service (port exhaustion).

HIGH 7.5EPSS 5.32%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (5.32%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

CVSS 3.0: 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 5.32% probability · 93th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-399
Affected: digium/asterisk · digium/certified asterisk · debian/debian linux
Source: cve@mitre.org

EPSS trend

EPSS 5.3% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

http://downloads.asterisk.org/pub/security/AST-2016-007.htmlMitigation, Vendor Advisory
http://www.debian.org/security/2016/dsa-3700Third Party Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838832Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1374733Issue Tracking, Patch
https://issues.asterisk.org/jira/browse/ASTERISK-26272Issue Tracking, Patch, Third Party Advisory
http://downloads.asterisk.org/pub/security/AST-2016-007.htmlMitigation, Vendor Advisory
http://www.debian.org/security/2016/dsa-3700Third Party Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838832Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1374733Issue Tracking, Patch
https://issues.asterisk.org/jira/browse/ASTERISK-26272Issue Tracking, Patch, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.