# CVE-2023-35855: Memory corruption in n/a

> A malicious game server can execute arbitrary code on a remote client via a buffer overflow in the Counter-Strike game client.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Jun 2023
- **Updated:** 11 Dec 2024
- **Also known as:** GHSA-4426-3833-j328

## What is CVE-2023-35855?

CVE-2023-35855 is a critical memory corruption vulnerability in n/a, published on 19 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A buffer overflow in Counter-Strike through 8684 allows a game server to execute arbitrary code on a remote client's machine by modifying the lservercfgfile console variable.

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

## Which versions are affected by CVE-2023-35855?

It affects 1 product.


Products: Valvesoftware Counter-Strike.

## How do I fix CVE-2023-35855?

No fix has been published for CVE-2023-35855 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-35855 being exploited?

There is no known exploitation of CVE-2023-35855 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-38312](https://insights.sbomify.com/CVE-2023-38312/): Path traversal in n/a (high 7.5)
- [CVE-2008-7203](https://insights.sbomify.com/CVE-2008-7203/): Valve Software Half-Life Counter-Strike 1.6 allows remote attackers to cause a denial of service (crash) via multiple crafted login packets. (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-35855 and fix it if it is affected.

What it is: CVE-2023-35855 is a critical memory corruption vulnerability in n/a, published on 19 Jun 2023. 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-2023-35855 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-2023-35855/ (Markdown: https://insights.sbomify.com/CVE-2023-35855/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-35855
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-35855
- OSV: https://osv.dev/vulnerability/CVE-2023-35855

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-35855/
Summaries are generated and may contain mistakes; the official description above is the record.