How severe is CVE-2025-63666?

CVE-2025-63666 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-63666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-63666?

CVE-2025-63666 affects Tenda Ac15 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-63666?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-63666 have an EU (EUVD) identifier?

Yes. CVE-2025-63666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-131903.

When was CVE-2025-63666 published?

CVE-2025-63666 was published on 2025-11-12 and last updated on 2026-06-17.

CVE-2025-63666

CVE-2025-63666 is a critical-severity vulnerability in Tenda Ac15 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-131903
Weakness: CWE-284
Affected product: Tenda Ac15 Firmware
Published: 2025-11-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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 a victim browser can steal the cookie and replay it to access protected resources.
How severe is CVE-2025-63666?: CVE-2025-63666 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-63666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-63666?: CVE-2025-63666 affects Tenda Ac15 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-63666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-63666 have an EU (EUVD) identifier?: Yes. CVE-2025-63666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-131903.
When was CVE-2025-63666 published?: CVE-2025-63666 was published on 2025-11-12 and last updated on 2026-06-17.

References

https://github.com/Remenis/CVE-2025-63666

Affected products (1)

cpe:2.3:o:tenda:ac15_firmware:15.03.05.18:*:*:*:*:*:*:*

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