CVE-2019-18976
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 12.8%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 12.79% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- digium/asterisk · digium/certified asterisk · debian/debian linux
- Source
- cve@mitre.org
EPSS moved from 12.8% on 28 September 2026 to 12.8% on 3 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://downloads.asterisk.org/pub/security/AST-2019-008.htmlVendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/04/msg00001.htmlMailing List, Third Party Advisory
- https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.htmlThird Party Advisory, VDB Entry
- https://seclists.org/fulldisclosure/2019/Nov/20Mailing List, Third Party Advisory
- https://www.asterisk.org/downloads/security-advisoriesVendor Advisory
- https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1Third Party Advisory
- http://downloads.asterisk.org/pub/security/AST-2019-008.htmlVendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/04/msg00001.htmlMailing List, Third Party Advisory
- https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.htmlThird Party Advisory, VDB Entry
- https://seclists.org/fulldisclosure/2019/Nov/20Mailing List, Third Party Advisory
- https://www.asterisk.org/downloads/security-advisoriesVendor Advisory
- https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.