What is the CVSS score of CVE-2025-63666?

CVE-2025-63666 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Ac15 Firmware are affected by CVE-2025-63666?

CVE-2025-63666 presents critical security risk, a improper access control vulnerability rated CVSS 9.8.

Is there a public PoC exploit available for CVE-2025-63666?

Yes, a public proof-of-concept exploit is available for CVE-2025-63666. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-63666?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Monitor vendor channels for patch availability.

Ac15 Firmware CVE-2025-63666

CRITICAL

Improper Access Control (CWE-284)

2025-11-12 cve@mitre.org

Authentication Bypass Tenda Ac15 Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:21 vuln.today

PoC Detected

Nov 17, 2025 - 18:59 vuln.today

Public exploit code

CVE Published

Nov 12, 2025 - 15:15 nvd

CRITICAL 9.8

DescriptionCVE.org

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 a victim browser can steal the cookie and replay it to access protected resources.

AnalysisAI

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. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-284. 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 a victim browser can steal the cookie and replay it to access protected resources. Affected products include: Tenda Ac15 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.