# CVE-2025-63666: Information disclosure in n/a

> An attacker can steal authentication cookies containing password hashes and session IDs to access protected resources on the Tenda AC15 router.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Nov 2025
- **Updated:** 18 Nov 2025
- **Also known as:** GHSA-qrpj-fx7w-27q9

## What is CVE-2025-63666?

CVE-2025-63666 is a critical vulnerability in Tenda Ac15 Firmware, published on 12 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2025-63666?

It affects 1 product.


Products: Tenda Ac15 Firmware.

## How do I fix CVE-2025-63666?

No fix has been published for CVE-2025-63666 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-63666 being exploited?

There is no known exploitation of CVE-2025-63666 in the wild and no public exploit code.

Public exploit code:

- Tenda AC15 cookie exposure (github_poc): https://github.com/Remenis/CVE-2025-63666

## Other vulnerabilities in Tenda Ac15 Firmware

- [CVE-2020-10987](https://insights.sbomify.com/CVE-2020-10987/): Tenda AC1900 Router AC15 Model Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2026-24103](https://insights.sbomify.com/CVE-2026-24103/): Memory corruption in n/a (critical 9.8)
- [CVE-2026-24101](https://insights.sbomify.com/CVE-2026-24101/): Command injection in n/a (critical 9.8)
- [CVE-2026-24105](https://insights.sbomify.com/CVE-2026-24105/): Command injection in n/a (critical 9.8)
- [CVE-2025-29462](https://insights.sbomify.com/CVE-2025-29462/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-63666 and fix it if it is affected.

What it is: CVE-2025-63666 is a critical vulnerability in Tenda Ac15 Firmware, published on 12 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-63666 in the wild and no public exploit code.

Affected product: Tenda Ac15 Firmware. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-63666/ (Markdown: https://insights.sbomify.com/CVE-2025-63666/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-63666
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-63666
- OSV: https://osv.dev/vulnerability/CVE-2025-63666

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-63666/
Summaries are generated and may contain mistakes; the official description above is the record.