CVE-2016-9937

Name: CVE-2016-9937
Creator: NVD / NIST
Published: 2016-12-12T21:59:00.303+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.61%

Last modified Jun 17, 2026

CVE-2016-9937 is a vulnerability of currently unknown severity. An issue was discovered in Asterisk Open Source 13.12.x and 13.13.x before 13.13.1 and 14.x before 14.2.1. If an SDP offer or answer is received with the Opus codec and with the format parameters separated using a space the code responsible for parsing will recursively call itself until it crashes. EPSS estimates a 2.61% chance of exploitation in the next 30 days.

Description

An issue was discovered in Asterisk Open Source 13.12.x and 13.13.x before 13.13.1 and 14.x before 14.2.1. If an SDP offer or answer is received with the Opus codec and with the format parameters separated using a space the code responsible for parsing will recursively call itself until it crashes. This occurs as the code does not properly handle spaces separating the parameters. This does NOT require the endpoint to have Opus configured in Asterisk. This also does not require the endpoint to be authenticated. If guest is enabled for chan_sip or anonymous in chan_pjsip an SDP offer or answer is still processed and the crash occurs.

Metrics

EPSS Probability

2.61%

83.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Digium	Asterisk	13.12
Digium	Asterisk	13.13
Digium	Asterisk	14.0
Digium	Asterisk	14.1
Digium	Asterisk	14.01
Digium	Asterisk	14.1.1
Digium	Asterisk	14.1.2
Digium	Asterisk	14.02
Digium	Asterisk	14.2

References

http://downloads.asterisk.org/pub/security/AST-2016-008-13.diffPatch, Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2016-008-14.diffPatch, Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2016-008.htmlPatch, Vendor Advisory
http://www.securityfocus.com/bid/94792Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037407
https://issues.asterisk.org/jira/browse/ASTERISK-26579Patch, Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2016-008-13.diffPatch, Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2016-008-14.diffPatch, Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2016-008.htmlPatch, Vendor Advisory
http://www.securityfocus.com/bid/94792Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037407
https://issues.asterisk.org/jira/browse/ASTERISK-26579Patch, Vendor Advisory

Timeline

Published: Dec 12, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-9937?

How severe is CVE-2016-9937?

Severity scoring for CVE-2016-9937 is pending analysis. The EPSS model estimates a 2.61% probability of exploitation in the next 30 days.

How do I fix CVE-2016-9937?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-9937?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST