CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
76.7%
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.
packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html
seclists.org/fulldisclosure/2023/Dec/24
www.openwall.com/lists/oss-security/2023/12/15/7
github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05
github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq
github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race
lists.debian.org/debian-lts-announce/2023/12/msg00019.html
security.alpinelinux.org/vuln/CVE-2023-49786
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
76.7%