Vulnerability in Asterisk
CVE-2023-49786
Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6.
EPSS: 0.053 (91.8th percentile) — read the EPSS interpretation.
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.
Affected products
- Asterisk — versions < 18.20.1, >= 19.0.0, < 20.5.1, = 21.0.0
- Digium Asterisk — versions 21.0.0
- Sangoma Certified_asterisk — versions 13.13.0, 16.8.0, 18.9
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Exploit, x_refsource_MISC)
- security-advisories@github.com (Exploit, Mailing List)
- security-advisories@github.com (Exploit, VDB Entry, Third Party Advisory)
- security-advisories@github.com (Exploit, Mailing List, Third Party Advisory)
- security-advisories@github.com
Frequently asked questions
- What is CVE-2023-49786?
- CVE-2023-49786 is a high-severity vulnerability in Asterisk, classified under CWE-703. CVSS score: 7.5/10. Published 2023-12-14.
- How severe is CVE-2023-49786?
- High severity. CVSS v3 base score is 7.5 out of 10.