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CVE-2019-18976

7.5 · HIGH

An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x.

Published Nov 22, 2019CWE-476EPSS 12.79%

Overview

CVE-2019-18976 is a high-severity vulnerability. It was published on November 22, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 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 res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur. This is different from CVE-2019-18940.

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-2019-008.htmlReflists.debian.org/debian-lts-announce/2022/04/msg00001.htmlRefpacketstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.htmlRefseclists.org/fulldisclosure/2019/Nov/20Refwww.asterisk.org/downloads/security-advisoriesRefwww.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1Refdownloads.asterisk.org/pub/security/AST-2019-008.htmlReflists.debian.org/debian-lts-announce/2022/04/msg00001.htmlRefpacketstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.htmlRefseclists.org/fulldisclosure/2019/Nov/20

How CyberStrike helps

Frequently asked questions

What is CVE-2019-18976?

CVE-2019-18976 is a high-severity vulnerability. It was published on November 22, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-18976?

This vulnerability has a CVSS 3.1 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-2019-18976?

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-2019-18976?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-18976 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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