# CVE-2021-31658: Denial of service in n/a

> An attacker can crash the device and erase configuration by sending specially crafted data to the device description interface.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Jun 2021
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-w3x9-635p-2982

## What is CVE-2021-31658?

CVE-2021-31658 is a high-severity denial of service vulnerability in n/a, published on 10 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

TP-Link TL-SG2005, TL-SG2008, etc. 1.0.0 Build 20180529 Rel.40524 is affected by an Array index error. The interface that provides the "device description" function only judges the length of the received data, and does not filter special characters. This vulnerability will cause the application to crash, and all device configuration information will be erased.

Weakness: CWE-129 (Improper Validation of Array Index)

## Which versions are affected by CVE-2021-31658?

It affects 2 products.


Products: Tp-Link Tl-Sg2005 Firmware, Tp-Link Tl-Sg2008 Firmware.

## How do I fix CVE-2021-31658?

No fix has been published for CVE-2021-31658 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31658 being exploited?

There is no known exploitation of CVE-2021-31658 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-31659](https://insights.sbomify.com/CVE-2021-31659/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31658 and fix it if it is affected.

What it is: CVE-2021-31658 is a high-severity denial of service vulnerability in n/a, published on 10 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-31658 in the wild and no public exploit code.

Affected product: n/a. 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-2021-31658/ (Markdown: https://insights.sbomify.com/CVE-2021-31658/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31658
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31658
- OSV: https://osv.dev/vulnerability/CVE-2021-31658

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31658/
Summaries are generated and may contain mistakes; the official description above is the record.