Vulnerability in Digium Asterisk
CVE-2021-26717
An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.
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: 0.022 (81.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.8% 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: 0.022 · change: +0.000
Affected products
- Digium Asterisk
- Digium Certified Asterisk — versions 16.8
References
- downloads.asterisk.org/pub/security/ (Vendor Advisory)
- seclists.org/fulldisclosure/2021/Feb/58 (mailing-list, Patch, Mailing List, Third Party Advisory)
- downloads.asterisk.org/pub/security/AST-2021-002.html (Vendor Advisory)
- issues.asterisk.org/jira/browse/ASTERISK-29203 (Patch, Issue Tracking, Vendor Advisory)
- packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-202… (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-26717?
- CVE-2021-26717 is a high-severity vulnerability in Digium Asterisk. CVSS score: 7.5/10. Published 2021-02-18.
- How severe is CVE-2021-26717?
- High severity. CVSS v3 base score is 7.5 out of 10.