# CVE-2022-32548: Memory corruption in n/a

> A buffer overflow in DrayTek Vigor routers allows attackers to execute arbitrary code or cause denial of service via crafted login credentials.

- **Severity:** Critical 10.0 (`CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:C/UI:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Aug 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-r59x-897w-8h5j

## What is CVE-2022-32548?

CVE-2022-32548 is a critical memory corruption vulnerability in Draytek Vigor3910 Firmware, published on 29 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered on certain DrayTek Vigor routers before July 2022 such as the Vigor3910 before 4.3.1.1. /cgi-bin/wlogin.cgi has a buffer overflow via the username or password to the aa or ab field.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2022-32548?

It affects 68 products.


Products: Draytek Vigor1000b Firmware, Draytek Vigor165 Firmware, Draytek Vigor166 Firmware, Draytek Vigor2133 Firmware, Draytek Vigor2133ac Firmware, Draytek Vigor2133fvac Firmware, Draytek Vigor2133n Firmware, Draytek Vigor2133vac Firmware, Draytek Vigor2135 Firmware, Draytek Vigor2135ac Firmware, Draytek Vigor2135fvac Firmware, Draytek Vigor2135vac Firmware, Draytek Vigor2620l Firmware, Draytek Vigor2620ln Firmware, Draytek Vigor2762 Firmware, Draytek Vigor2762ac Firmware, Draytek Vigor2762n Firmware, Draytek Vigor2762vac Firmware, Draytek Vigor2765 Firmware, Draytek Vigor2765ac Firmware and 48 more.

## How do I fix CVE-2022-32548?

No fix has been published for CVE-2022-32548 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-32548 being exploited?

There is no known exploitation of CVE-2022-32548 in the wild and no public exploit code.

Public exploit code:

- https://github.com/MosaedH/CVE-2022-32548-RCE-POC (github_poc): https://github.com/MosaedH/CVE-2022-32548-RCE-POC

## Other vulnerabilities in Draytek Vigor3910 Firmware

- [CVE-2024-51138](https://insights.sbomify.com/CVE-2024-51138/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-51139](https://insights.sbomify.com/CVE-2024-51139/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-41593](https://insights.sbomify.com/CVE-2024-41593/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-41588](https://insights.sbomify.com/CVE-2024-41588/): Memory corruption in n/a (high 8.0)
- [CVE-2024-41590](https://insights.sbomify.com/CVE-2024-41590/): Memory corruption in n/a (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-32548 and fix it if it is affected.

What it is: CVE-2022-32548 is a critical memory corruption vulnerability in Draytek Vigor3910 Firmware, published on 29 Aug 2022. 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-2022-32548 in the wild and no public exploit code.

Affected product: Draytek Vigor3910 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-2022-32548/ (Markdown: https://insights.sbomify.com/CVE-2022-32548/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-32548
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-32548
- OSV: https://osv.dev/vulnerability/CVE-2022-32548

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-32548/
Summaries are generated and may contain mistakes; the official description above is the record.