# CVE-2024-7157: TOTOLINK A3100R getSaveConfig buffer overflow

> Remote attackers can trigger a buffer overflow in the TOTOLINK A3100R router via the http_host parameter, potentially leading to code execution.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Jul 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-g7wm-rhw5-7wrp

## What is CVE-2024-7157?

CVE-2024-7157 is a high-severity memory corruption vulnerability in TOTOLINK A3100R, published on 28 Jul 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in TOTOLINK A3100R 4.1.2cu.5050_B20200504. It has been classified as critical. This affects the function getSaveConfig of the file /cgi-bin/cstecgi.cgi?action=save&setting. The manipulation of the argument http_host leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-272571. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

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

## Which versions are affected by CVE-2024-7157?

It affects 1 product.


Products: Totolink A3100r Firmware.

## How do I fix CVE-2024-7157?

No fix has been published for CVE-2024-7157 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-7157 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-7157 exists.

## Other vulnerabilities in TOTOLINK A3100R

- [CVE-2025-28256](https://insights.sbomify.com/CVE-2025-28256/): Command injection in n/a (critical 9.8)
- [CVE-2024-42546](https://insights.sbomify.com/CVE-2024-42546/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-42547](https://insights.sbomify.com/CVE-2024-42547/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-29644](https://insights.sbomify.com/CVE-2022-29644/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2022-29645](https://insights.sbomify.com/CVE-2022-29645/): Hardcoded credentials in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-7157 and fix it if it is affected.

What it is: CVE-2024-7157 is a high-severity memory corruption vulnerability in TOTOLINK A3100R, published on 28 Jul 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-7157 exists.

Affected product: TOTOLINK A3100R. 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-2024-7157/ (Markdown: https://insights.sbomify.com/CVE-2024-7157/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-7157
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-7157
- OSV: https://osv.dev/vulnerability/CVE-2024-7157

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-7157/
Summaries are generated and may contain mistakes; the official description above is the record.