# CVE-2018-18820: Memory corruption in n/a

> A buffer overflow in Icecast's URL-authentication backend allows remote attackers to cause denial of service or execute code if the backend is enabled.

- **Severity:** High 8.1 (`CVSS:3.0/AV:N/AC:H/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:** Yes
- **Published:** 5 Nov 2018
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2018-18820, DEBIAN-CVE-2018-18820, DLA-1588-1, DSA-4333-1, GHSA-w249-6p6f-4gjq, MGASA-2018-0472, UBUNTU-CVE-2018-18820

## What is CVE-2018-18820?

CVE-2018-18820 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 5 Nov 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A buffer overflow was discovered in the URL-authentication backend of the Icecast before 2.4.4. If the backend is enabled, then any malicious HTTP client can send a request for that specific resource including a crafted header, leading to denial of service and potentially remote code execution.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-18820?

It affects 2 products.


Products: Debian Debian Linux, Xiph Icecast.

## How do I fix CVE-2018-18820?

Upgrade to a fixed version.

## Is CVE-2018-18820 being exploited?

There is no known exploitation of CVE-2018-18820 in the wild and no public exploit code.

Public exploit code:

- CVE-2018-18820 checker for Icecast servers (github_poc): https://github.com/impulsiveness/CVE-2018-18820

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-18820 and fix it if it is affected.

What it is: CVE-2018-18820 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 5 Nov 2018. 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-2018-18820 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2018-18820/ (Markdown: https://insights.sbomify.com/CVE-2018-18820/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18820
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18820
- OSV: https://osv.dev/vulnerability/CVE-2018-18820

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18820/
Summaries are generated and may contain mistakes; the official description above is the record.