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CVE-2016-9937

7.5 · HIGH

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.

Published Dec 12, 2016CWE-119EPSS 2.61%

Overview

CVE-2016-9937 is a high-severity vulnerability. It was published on December 12, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdownloads.asterisk.org/pub/security/AST-2016-008-13.diffRefdownloads.asterisk.org/pub/security/AST-2016-008-14.diffRefdownloads.asterisk.org/pub/security/AST-2016-008.htmlRefwww.securityfocus.com/bid/94792Refwww.securitytracker.com/id/1037407Refissues.asterisk.org/jira/browse/ASTERISK-26579Refdownloads.asterisk.org/pub/security/AST-2016-008-13.diffRefdownloads.asterisk.org/pub/security/AST-2016-008-14.diffRefdownloads.asterisk.org/pub/security/AST-2016-008.htmlRefwww.securityfocus.com/bid/94792

How CyberStrike helps

Frequently asked questions

What is CVE-2016-9937?

CVE-2016-9937 is a high-severity vulnerability. It was published on December 12, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2016-9937?

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-9937?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-9937?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-9937 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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