# CVE-2026-2147: Tenda AC21 Web Management DownloadLog information disclosure

> Remote attackers can access sensitive log data via the DownloadLog interface in Tenda AC21 routers, potentially exposing system information.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Feb 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-qg34-2w8p-vh8q

## What is CVE-2026-2147?

CVE-2026-2147 is a medium-severity vulnerability in Tenda AC21, published on 8 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A weakness has been identified in Tenda AC21 16.03.08.16. This impacts an unknown function of the file /cgi-bin/DownloadLog of the component Web Management Interface. Executing a manipulation can lead to information disclosure. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.

Weakness: CWE-284 (Improper Access Control), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-2147?

It affects 1 product.


Products: Tenda Ac21 Firmware.

## How do I fix CVE-2026-2147?

No fix has been published for CVE-2026-2147 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2147 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2147 exists.

## Other vulnerabilities in Tenda AC21

- [CVE-2025-9605](https://insights.sbomify.com/CVE-2025-9605/): Tenda AC21/AC23 GetParentControlInfo stack-based overflow (critical 9.3)
- [CVE-2023-24333](https://insights.sbomify.com/CVE-2023-24333/): Command injection in n/a (high 8.8)
- [CVE-2026-4565](https://insights.sbomify.com/CVE-2026-4565/): Tenda AC21 SetNetControlList formSetQosBand buffer overflow (high 8.7)
- [CVE-2026-1637](https://insights.sbomify.com/CVE-2026-1637/): Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow (high 8.7)
- [CVE-2025-13445](https://insights.sbomify.com/CVE-2025-13445/): Tenda AC21 SetIpMacBind stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2147 and fix it if it is affected.

What it is: CVE-2026-2147 is a medium-severity vulnerability in Tenda AC21, published on 8 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2147 exists.

Affected product: Tenda AC21. 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-2026-2147/ (Markdown: https://insights.sbomify.com/CVE-2026-2147/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2147
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2147
- OSV: https://osv.dev/vulnerability/CVE-2026-2147

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2147/
Summaries are generated and may contain mistakes; the official description above is the record.