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CVE-2023-51443— FreeSWITCH susceptible to Denial of Service via DTLS Hello packets during call initiation

Quick assessment

Affected
signalwire freeswitch
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.

FreeSWITCH是美国Anthony Minessale个人开发者的研发的一套免费、开源的通信软件。该软件可用于创建音、视频以及短消息类产品和应用。 FreeSWITCH 1.10.10版本存在安全漏洞，该漏洞源于DTLS协议的握手阶段存在拒绝服务（DOS）漏洞。

CVSS 7.5 · High EPSS 1.49% · P73
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I. Basic Information for CVE-2023-51443

Vulnerability Information
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Vulnerability Title
FreeSWITCH susceptible to Denial of Service via DTLS Hello packets during call initiation
Source: CVE Program / CVE List V5
Vulnerability Description
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.10.11, when handling DTLS-SRTP for media setup, FreeSWITCH is susceptible to Denial of Service due to a race condition in the hello handshake phase of the DTLS protocol. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. If an attacker manages to send a ClientHello DTLS message with an invalid CipherSuite (such as `TLS_NULL_WITH_NULL_NULL`) to the port on the FreeSWITCH server that is expecting packets from the caller, a DTLS error is generated. This results in the media session being torn down, which is followed by teardown at signaling (SIP) level too. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable FreeSWITCH servers for calls that rely on DTLS-SRTP. To address this vulnerability, upgrade FreeSWITCH to 1.10.11 which includes the security fix. The solution implemented is to drop all packets from addresses that have not been validated by an ICE check.
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
FreeSWITCH 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeSWITCH是美国Anthony Minessale个人开发者的研发的一套免费、开源的通信软件。该软件可用于创建音、视频以及短消息类产品和应用。 FreeSWITCH 1.10.10版本存在安全漏洞，该漏洞源于DTLS协议的握手阶段存在拒绝服务（DOS）漏洞。
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
signalwire freeswitch < 1.10.11 -

II. Public POCs for CVE-2023-51443

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9855 chars
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III. Intelligence Information for CVE-2023-51443

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Patches & Fixes for CVE-2023-51443 (1)

Vendor Advisories for CVE-2023-51443 (1)

Exploits & Public PoCs for CVE-2023-51443 (1)

IV. Related Vulnerabilities

Same product: freeswitch
Same vendor: signalwire
Same weakness: CWE-703

V. Comments for CVE-2023-51443

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