CVE-2016-9937
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.61% probability · 85th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- digium/asterisk
- Source
- cve@mitre.org
EPSS 2.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.