NULL pointer dereference in Asterisk Certified
CVE-2021-46837
res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.044 (91.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.044 · change: +0.022
Affected products
- Asterisk Certified — versions 16.8.0
- Digium Asterisk
- Debian Linux — versions 9.0, 10.0, 11.0
Weakness classification (CWE)
References
- downloads.asterisk.org/pub/security/AST-2021-006.html (Vendor Advisory)
- lists.debian.org/debian-lts-announce/2022/11/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2022/dsa-5285 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-46837?
- CVE-2021-46837 is a medium-severity vulnerability in Asterisk Certified, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2022-08-30.
- How severe is CVE-2021-46837?
- Medium severity. CVSS v3 base score is 6.5 out of 10.