CVE-2016-2316· NVD / CVE Program· CNA mitre

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-ce

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.

MediumCVSS 5.9 · v3.0—No exploit Fix available

Published: Feb 22, 2016
Updated: Jun 16, 2026
EPSS: 5.0% · 92th percentile
CWE: CWE-191

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Action score

Monitor

Low priority for now.

CVSS: 23 / 40 · 5.9 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 5.0%

Affected systems

Vendor	Product	CPE
fedoraproject	fedora	cpe:2.3:o:fedoraproject:fedora
digium	asterisk	cpe:2.3:a:digium:asterisk
digium	certified asterisk	cpe:2.3:a:digium:certified_asterisk

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

digium asterisk1.8.0
digium asterisk1.8.1
digium asterisk1.8.1.1
digium asterisk1.8.1.2
digium asterisk1.8.10.0
digium asterisk1.8.10.1
digium asterisk1.8.11.0
digium asterisk1.8.11.1
digium asterisk1.8.12
digium asterisk1.8.12.0
digium asterisk1.8.12.1
digium asterisk1.8.12.2
digium asterisk1.8.13.0
digium asterisk1.8.13.1
digium asterisk1.8.14.0
digium asterisk1.8.14.1
digium asterisk1.8.15.0
digium asterisk1.8.15.1
digium asterisk1.8.16.0
digium asterisk1.8.17.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:14	asterisk	before 1:13.7.2~dfsg-1	1:13.7.2~dfsg-1
Debian:8	asterisk	before 1:11.13.1~dfsg-2+deb8u1	1:11.13.1~dfsg-2+deb8u1

Same product

fedoraproject: all records

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41Plan
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41Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
debian:asterisk	1:13.7.2~dfsg-1 · Debian:14	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-191 · Integer Underflow (Wrap or Wraparound)

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

Fix✗ → ✓Sep 28, 2026, 10:49 PM UTC

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records