Buffer overflow in Digium Asterisk
CVE-2021-26713
A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is caused by a signedness comparison mismatch.
Vulnerability class: Buffer Overflow
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: 0.019 (78.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.019 · change: +0.000
Affected products
- Digium Asterisk
- Digium Certified Asterisk — versions 16.8
Weakness classification (CWE)
References
- downloads.asterisk.org/pub/security/ (Vendor Advisory)
- downloads.asterisk.org/pub/security/AST-2021-004.html (Vendor Advisory)
- issues.asterisk.org/jira/browse/ASTERISK-29205 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-26713?
- CVE-2021-26713 is a medium-severity vulnerability in Digium Asterisk, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2021-02-19.
- How severe is CVE-2021-26713?
- Medium severity. CVSS v3 base score is 6.5 out of 10.