Home/CVE/An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If i
CVE

CVE-2019-18976

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

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.

HIGH · CVSS 7.5 EPSS 0.00166
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-476NULL Pointer Dereference
▤

Affected Products & Versions

3
digium asterisk>= 13.0.0 and <= 13.29.1
digium certified asteriskall versions
debian linuxall versions
⚠

Public Exploits & PoCs

1
pocpacketstormsecurity.com · Asterisk-Project-Security-Advisory-AST-2019-008.htmlpacketstormsecurity.com
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Nov 2019 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://downloads.asterisk.org/pub/security/AST-2019-008.htmlVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.htmlMailing ListThird Party Advisory
https://seclists.org/fulldisclosure/2019/Nov/20Mailing ListThird Party Advisory
https://www.asterisk.org/downloads/security-advisoriesVendor Advisory
https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1Third Party Advisory
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