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Vulnerability record · CVE-2019-18976 · published 22 November 2019

CVE-2019-18976: Digium asterisk null pointer dereference vulnerability

Digium · Asterisk

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.

7.5 CVSS 3.1 High EPSS 6.7% · top 6.3% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
6.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://downloads.asterisk.org/pub/security/AST-2019-008.html Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html Mailing ListThird Party Advisory
https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html Third Party AdvisoryVDB Entry
https://seclists.org/fulldisclosure/2019/Nov/20 Mailing ListThird Party Advisory
https://www.asterisk.org/downloads/security-advisories Vendor Advisory
https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1 Third Party Advisory
http://downloads.asterisk.org/pub/security/AST-2019-008.html Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html Mailing ListThird Party Advisory
https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html Third Party AdvisoryVDB Entry
https://seclists.org/fulldisclosure/2019/Nov/20 Mailing ListThird Party Advisory
https://www.asterisk.org/downloads/security-advisories Vendor Advisory
https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-18976), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.