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CVE-2020-4067— Improper Initialization in coturn

Quick assessment

Affected
coturn coturn
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.

CoTURN是一款TURN（VoIP媒体业务NAT穿越服务器和网关）和STUN（用户数据报协议简单穿越网络地址转换器）Server的开源实现。 CoTURN 4.5.1.3之前版本中存在安全漏洞，该漏洞源于程序没有正确初始化STUN/TURN响应缓冲区。攻击者可利用该漏洞获取信息。

CVSS 7.0 · High EPSS 1.90% · P79

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2020-4067

Vulnerability Information
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Vulnerability Title
Improper Initialization in coturn
Source: CVE Program / CVE List V5
Vulnerability Description
In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN response buffer is not initialized properly. There is a leak of information between different client connections. One client (an attacker) could use their connection to intelligently query coturn to get interesting bytes in the padding bytes from the connection of another client. This has been fixed in 4.5.1.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
初始化不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
CoTURN 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoTURN是一款TURN（VoIP媒体业务NAT穿越服务器和网关）和STUN（用户数据报协议简单穿越网络地址转换器）Server的开源实现。 CoTURN 4.5.1.3之前版本中存在安全漏洞，该漏洞源于程序没有正确初始化STUN/TURN响应缓冲区。攻击者可利用该漏洞获取信息。
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
coturn coturn >= 5.1.1, < 6.0.0 -

II. Public POCs for CVE-2020-4067

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7751 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2020-4067

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Vendor Advisories for CVE-2020-4067 (2)

Mailing List Discussions for CVE-2020-4067 (4)

Other References for CVE-2020-4067 (2)

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-665

V. Comments for CVE-2020-4067

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