What is CVE-2016-2316?

CVE-2016-2316 is a medium-severity vulnerability in Digium Asterisk, classified under Integer Underflow. CVSS score: 5.9/10. Published 2016-02-22.

How severe is CVE-2016-2316?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2016-2316 known to be exploited?

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

Integer overflow in Digium Asterisk

CVE-2016-2316

chan_sip in Asterisk Open Source 1.8.x, 11.x before 11.21.1, 12.x, and 13.x before 13.7.1 and Certified Asterisk 1.8.28, 11.6 before 11.6-cert12, and 13.1 before 13.1-cert3, when the timert1 sip.conf configuration is set to a value greater than 1245, allows remote attackers to cause a denial of service (file descriptor consumption) via vectors related to large retransmit timeout values.

Published 2016-02-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.050 (91.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.050 · newest: 0.050 · change: -0.000

Affected products

Digium Asterisk — versions 1.8.0, 1.8.1, 1.8.1.1
Digium Certified Asterisk — versions 1.8.28, 11.6, 11.6.0
Fedoraproject Fedora — versions 22, 23

Weakness classification (CWE)

CWE-191 — Integer Underflow

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.securityfocus.com/bid/82651 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1034930 (VDB Entry, Third Party Advisory, vdb-entry)
lists.fedoraproject.org/pipermail/package-announce/2016-February/177409.html (vendor-advisory, Third Party Advisory)
lists.fedoraproject.org/pipermail/package-announce/2016-February/177422.html (vendor-advisory, Third Party Advisory)
www.debian.org/security/2016/dsa-3700 (vendor-advisory)
downloads.asterisk.org/pub/security/AST-2016-002.html (Exploit, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2016-2316?: CVE-2016-2316 is a medium-severity vulnerability in Digium Asterisk, classified under Integer Underflow. CVSS score: 5.9/10. Published 2016-02-22.
How severe is CVE-2016-2316?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2016-2316 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.