No exploitation reportedFix available

CVE-2016-9937

No exploitation reported by the sources we read.

Published2016-12-12
WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2016-12-1221:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-9937?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-9937?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Digium asterisk

Branch	Affected	Fixed in	Source
13.12	= 13.12	no fix published	NVD
13.13	= 13.13	no fix published	NVD
14.0	= 14.0	no fix published	NVD
14.1	= 14.1	no fix published	NVD
14.1	= 14.01	no fix published	NVD
14.1	= 14.1.1	no fix published	NVD
14.1	= 14.1.2	no fix published	NVD
14.2	= 14.02	no fix published	NVD
14.2	= 14.2	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

downloads.asterisk.orgPatch · Vendor Advisory
downloads.asterisk.orgPatch · Vendor Advisory
downloads.asterisk.orgPatch · Vendor Advisory
issues.asterisk.orgPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-119read 2026-10-23
FIRST EPSSEPSS score2.6 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2016-12-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-9937?

Is CVE-2016-9937 actively exploited?

Active exploitation of CVE-2016-9937 has not been confirmed. Its EPSS score was 2.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-9937?

CVE-2016-9937 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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