CVE-2016-9937: n/a vulnerability

CVE-2016-9937: 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.

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 03:07 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2016-9937 is a denial-of-service flaw in Asterisk Open Source. A malformed SDP message involving Opus codec parameters can make affected Asterisk versions crash. The issue can be reachable without authentication when guest or anonymous SIP handling is enabled, creating business risk for exposed voice infrastructure. Exposure is most likely in internet-reachable or partner-reachable Asterisk SIP services running the affected branches, especially where chan_sip guest access or chan_pjsip anonymous access is enabled. Internal-only deployments still face risk from untrusted network segments or compromised endpoints. Prioritize remediation for exposed Asterisk systems because the impact is service outage, potentially without authentication. Voice service interruptions can disrupt customer contact, call routing, and operational response. Systems already upgraded beyond the fixed versions are lower priority. Mitigation focus: Upgrade Asterisk 13 to 13.13.1 or later.; Upgrade Asterisk 14 to 14.2.1 or later.; Review AST-2016-008 vendor guidance and applicable patches..

Prepared: Jun 13, 2026, 13:16 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 12, 2016, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

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2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://issues.asterisk.org/jira/browse/ASTERISK-26579CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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