# CVE-2018-6532: Denial of service in n/a

> Attackers can exhaust server memory via crafted requests, triggering the OOM killer and causing denial of service in Icinga.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 27 Feb 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-6532, GHSA-7vvj-647q-jgx2, UBUNTU-CVE-2018-6532

## What is CVE-2018-6532?

CVE-2018-6532 is a high-severity denial of service vulnerability in n/a, published on 27 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Icinga 2.x through 2.8.1. By sending specially crafted (authenticated and unauthenticated) requests, an attacker can exhaust a lot of memory on the server side, triggering the OOM killer.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2018-6532?

It affects 1 product.


Products: Icinga Icinga.

## How do I fix CVE-2018-6532?

Upgrade to a fixed version.

## Is CVE-2018-6532 being exploited?

There is no known exploitation of CVE-2018-6532 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-48057](https://insights.sbomify.com/CVE-2025-48057/): Icinga 2 certificate renewal might incorrectly renew an invalid certificate (critical 9.3)
- [CVE-2020-29663](https://insights.sbomify.com/CVE-2020-29663/): Security feature bypass in n/a (critical 9.1)
- [CVE-2024-24820](https://insights.sbomify.com/CVE-2024-24820/): Icinga Director configuration is susceptible to Cross-Site Request Forgery (high 8.3)
- [CVE-2018-6535](https://insights.sbomify.com/CVE-2018-6535/): Information disclosure in n/a (high 8.1)
- [CVE-2020-14004](https://insights.sbomify.com/CVE-2020-14004/): Path traversal in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-6532 and fix it if it is affected.

What it is: CVE-2018-6532 is a high-severity denial of service vulnerability in n/a, published on 27 Feb 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-2018-6532 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-2018-6532/ (Markdown: https://insights.sbomify.com/CVE-2018-6532/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-6532
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-6532
- OSV: https://osv.dev/vulnerability/CVE-2018-6532

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-6532/
Summaries are generated and may contain mistakes; the official description above is the record.