Is CVE-2025-53940 in the CISA KEV catalog?

No. CVE-2025-53940 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the EPSS score for CVE-2025-53940?

CVE-2025-53940 has an EPSS score of 2.65% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2025-53940?

No published fix for CVE-2025-53940 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2025-53940

UNSCOREDEPSS 84th pctl

NVD

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.

CWE-208

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3.1 Vector

No CVSS vector data available.

Exploit Intelligence

2.65%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Other references3

Embed a live status badge for CVE-2025-53940

Markdown

[![CVE-2025-53940](https://tridentstack.com/cve/badge/CVE-2025-53940.svg)](https://tridentstack.com/cve/CVE-2025-53940)

HTML

<a href="https://tridentstack.com/cve/CVE-2025-53940"><img src="https://tridentstack.com/cve/badge/CVE-2025-53940.svg" alt="CVE-2025-53940"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-07-25.