What is CVE-2025-63666?

CVE-2025-63666 is a critical-severity vulnerability in Tenda Ac15, classified under Improper Access Control. CVSS score: 9.8/10. Published 2025-11-12.

How severe is CVE-2025-63666?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-63666 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Tenda Ac15

CVE-2025-63666

Tenda AC15 v15.03.05.18_multi) issues an authentication cookie that exposes the account password hash to the client and uses a short, low-entropy suffix as the session identifier. An attacker with network access or the ability to run JS in…

EPSS: 0.004 (33.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Tenda Ac15
Tenda Ac15_firmware — versions 15.03.05.18
N/a — versions n/a

Weakness classification (CWE)

CWE-284 — Improper Access Control

Public proof-of-concept exploits

Remenis/CVE-2025-63666

References

cve@mitre.org (Exploit, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2025-63666?: CVE-2025-63666 is a critical-severity vulnerability in Tenda Ac15, classified under Improper Access Control. CVSS score: 9.8/10. Published 2025-11-12.
How severe is CVE-2025-63666?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-63666 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.