What is CVE-2025-66902?

CVE-2025-66902 is a high-severity vulnerability in Pithikos Websocket Server, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-01-20.

How severe is CVE-2025-66902?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Pithikos Websocket Server

CVE-2025-66902

An input validation issue in in Pithikos websocket-server v.0.6.4 allows a remote attacker to obtain sensitive information or cause unexpected server behavior via the websocket_server/websocket_server.py, WebSocketServer._message_received components.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-01-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Pithikos Websocket Server — versions 0.6.4

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

github.com/cyberinvest211/websocket-server-vuln-poc/tree/main (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-66902?: CVE-2025-66902 is a high-severity vulnerability in Pithikos Websocket Server, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-01-20.
How severe is CVE-2025-66902?: High severity. CVSS v3 base score is 7.5 out of 10.