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CVE-2019-18976

Date: November 22, 2019

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.

Severity Score

Related Resources (10)

https://www.asterisk.org/downloads/security-advisories
https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1
http://downloads.asterisk.org/pub/security/AST-2019-008.html
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-18976
https://seclists.org/fulldisclosure/2019/Nov/20
https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html
https://nvd.nist.gov/vuln/detail/CVE-2019-18976
https://security-tracker.debian.org/tracker/CVE-2019-18976
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html
https://www.mend.io/vulnerability-database/CVE-2019-18976

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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