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CVE-2023-49786— Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation

Quick assessment

Affected
asterisk asterisk
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Asterisk是一款PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk 18.20.1 之前、20.5.1 之前 和 21.0.1 之前版本、Certified-asterisk 18.9-cert6 之前版本存在安全漏洞，该漏洞源于在处理用于媒体设置的 DTLS-SRTP 时，由于 DTLS 协议的 hello 握手阶段的竞争条件，Asterisk 容易受到 DoS 的影响。

CVSS 7.5 · High EPSS 5.29% · P92

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-49786

Vulnerability Information
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Vulnerability Title
Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件检查或处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Asterisk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Asterisk是一款PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk 18.20.1 之前、20.5.1 之前 和 21.0.1 之前版本、Certified-asterisk 18.9-cert6 之前版本存在安全漏洞，该漏洞源于在处理用于媒体设置的 DTLS-SRTP 时，由于 DTLS 协议的 hello 握手阶段的竞争条件，Asterisk 容易受到 DoS 的影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
asterisk asterisk < 18.20.1 -

II. Public POCs for CVE-2023-49786

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Qwen3.6-35B-A3B · 8136 chars
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III. Intelligence Information for CVE-2023-49786

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Patches & Fixes for CVE-2023-49786 (1)

Vendor Advisories for CVE-2023-49786 (1)

Exploits & Public PoCs for CVE-2023-49786 (1)

Mailing List Discussions for CVE-2023-49786 (3)

Other References for CVE-2023-49786 (1)

Same Patch Batch · asterisk · 2023-12-14 · 3 CVEs total

CVE-2023-37457 7.5 HIGH Asterisk's PJSIP_HEADER dialplan function can overwrite memory/cause crash when using 'upd
CVE-2023-49294 4.9 MEDIUM Asterisk Path Traversal vulnerability

IV. Related Vulnerabilities

Same product: asterisk
Same vendor: asterisk
Same weakness: CWE-703

V. Comments for CVE-2023-49786

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