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CVE-2025-53940— Quiet uses insecure, inconsistent verification on local backend token

Quick assessment

Affected
TryQuiet quiet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Quiet是Quiet开源的一个基于私有p2p软件。 Quiet 6.1.0-alpha.4及之前版本存在安全漏洞，该漏洞源于令牌验证使用不安全的非恒定时间比较函数，可能导致计时攻击。

AI Predicted 7.5 Difficulty: Hard EPSS 3.57% · P89
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I. Basic Information for CVE-2025-53940

Vulnerability Information
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Vulnerability Title
Quiet uses insecure, inconsistent verification on local backend token
Source: CVE Program / CVE List V5
Vulnerability Description
Quiet is an alternative to team chat apps like Slack, Discord, and Element that does not require trusting a central server or running one's own. In versions 6.1.0-alpha.4 and below, Quiet's API for backend/frontend communication was using an insecure, not constant-time comparison function for token verification. This allowed for a potential timing attack where an attacker would try different token values and observe tiny differences in the response time (wrong characters fail faster) to guess the whole token one character at a time. This is fixed in version 6.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Quiet 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Quiet是Quiet开源的一个基于私有p2p软件。 Quiet 6.1.0-alpha.4及之前版本存在安全漏洞，该漏洞源于令牌验证使用不安全的非恒定时间比较函数，可能导致计时攻击。
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
TryQuiet quiet < 6.0.1 -

II. Public POCs for CVE-2025-53940

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III. Intelligence Information for CVE-2025-53940

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IV. Related Vulnerabilities

Same weakness: CWE-208

V. Comments for CVE-2025-53940

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