# CVE-2024-7155: TOTOLINK A3300R shadow.sample hard-coded password

> A hard-coded password in the shadow.sample file allows local attackers to bypass authentication and escalate privileges on TOTOLINK A3300R routers.

- **Severity:** Low 2.0 (`CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Jul 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-w439-8pfm-9pjm

## What is CVE-2024-7155?

CVE-2024-7155 is a low-severity vulnerability in Totolink A3300r Firmware, published on 28 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been found in TOTOLINK A3300R 17.0.0cu.557_B20221024 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /etc/shadow.sample. The manipulation leads to use of hard-coded password. It is possible to launch the attack on the local host. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The identifier VDB-272569 was assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-798 (Use of Hard-coded Credentials), CWE-259 (Use of Hard-coded Password)

## Which versions are affected by CVE-2024-7155?

It affects 1 product.


Products: Totolink A3300r Firmware.

## How do I fix CVE-2024-7155?

No fix has been published for CVE-2024-7155 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-7155 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-7155 exists.

## Other vulnerabilities in Totolink A3300r Firmware

- [CVE-2026-31175](https://insights.sbomify.com/CVE-2026-31175/): Command injection in n/a (critical 9.8)
- [CVE-2026-31177](https://insights.sbomify.com/CVE-2026-31177/): Command injection in n/a (critical 9.8)
- [CVE-2026-31178](https://insights.sbomify.com/CVE-2026-31178/): Command injection in n/a (critical 9.8)
- [CVE-2026-31181](https://insights.sbomify.com/CVE-2026-31181/): Command injection in n/a (critical 9.8)
- [CVE-2026-31170](https://insights.sbomify.com/CVE-2026-31170/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-7155 and fix it if it is affected.

What it is: CVE-2024-7155 is a low-severity vulnerability in Totolink A3300r Firmware, published on 28 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-7155 exists.

Affected product: Totolink A3300r 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-2024-7155/ (Markdown: https://insights.sbomify.com/CVE-2024-7155/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-7155
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-7155
- OSV: https://osv.dev/vulnerability/CVE-2024-7155

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-7155/
Summaries are generated and may contain mistakes; the official description above is the record.