Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2023-49786

7.5 · HIGH

Asterisk is an open source private branch exchange and telephony toolkit.

Published Dec 14, 2023CWE-703EPSS 5.29%

Overview

CVE-2023-49786 is a high-severity vulnerability. It was published on December 14, 2023 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.htmlRefseclists.org/fulldisclosure/2023/Dec/24Refwww.openwall.com/lists/oss-security/2023/12/15/7GitHubgithub.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-raceGitHubgithub.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05GitHubgithub.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pqReflists.debian.org/debian-lts-announce/2023/12/msg00019.htmlRefpacketstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.htmlRefseclists.org/fulldisclosure/2023/Dec/24Refwww.openwall.com/lists/oss-security/2023/12/15/7

How CyberStrike helps

Frequently asked questions

What is CVE-2023-49786?

CVE-2023-49786 is a high-severity vulnerability. It was published on December 14, 2023 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-49786?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-49786?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-49786?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-49786 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2023

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999