NULL pointer dereference in Digium Asterisk
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.128 (96.2th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.067 · newest: 0.128 · change: +0.061
Affected products
- Digium Asterisk
- Digium Certified Asterisk — versions 13.21
- Debian Linux — versions 9.0
Weakness classification (CWE)
References
- www.asterisk.org/downloads/security-advisories (Vendor Advisory)
- www.cybersecurity-help.cz/vdb/SB2019112218 (Third Party Advisory)
- packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-201… (VDB Entry, Third Party Advisory)
- seclists.org/fulldisclosure/2019/Nov/20 (Mailing List, Third Party Advisory)
- downloads.asterisk.org/pub/security/AST-2019-008.html (Vendor Advisory)
- lists.debian.org/debian-lts-announce/2022/04/msg00001.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-18976?
- CVE-2019-18976 is a high-severity vulnerability in Digium Asterisk, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2019-11-22.
- How severe is CVE-2019-18976?
- High severity. CVSS v3 base score is 7.5 out of 10.