# CVE-2020-15694: Other in n/a

> The Nim httpClient library fails to validate negative Content-Length headers, potentially causing denial of service when connecting to malicious servers.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-15694, GHSA-mwjr-9xqh-r2f5, UBUNTU-CVE-2020-15694

## What is CVE-2020-15694?

CVE-2020-15694 is a high-severity vulnerability in n/a, published on 14 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In Nim 1.2.4, the standard library httpClient fails to properly validate the server response. For example, httpClient.get().contentLength() does not raise any error if a malicious server provides a negative Content-Length.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-15694?

It affects 1 product.


Products: Nim-Lang Nim.

## How do I fix CVE-2020-15694?

Upgrade to a fixed version.

## Is CVE-2020-15694 being exploited?

There is no known exploitation of CVE-2020-15694 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-15690](https://insights.sbomify.com/CVE-2020-15690/): Other in n/a (critical 9.8)
- [CVE-2020-15692](https://insights.sbomify.com/CVE-2020-15692/): Command injection in n/a (critical 9.8)
- [CVE-2021-21372](https://insights.sbomify.com/CVE-2021-21372/): Nimble arbitrary code execution for specially crafted package metadata (high 8.3)
- [CVE-2021-21374](https://insights.sbomify.com/CVE-2021-21374/): Nimble fails to validate certificates due to insecure httpClient defaults (high 8.1)
- [CVE-2021-21373](https://insights.sbomify.com/CVE-2021-21373/): Nimble falls back to insecure http url when fetching packages (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-15694 and fix it if it is affected.

What it is: CVE-2020-15694 is a high-severity vulnerability in n/a, published on 14 Aug 2020. 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-2020-15694 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-2020-15694/ (Markdown: https://insights.sbomify.com/CVE-2020-15694/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-15694
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-15694
- OSV: https://osv.dev/vulnerability/CVE-2020-15694

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-15694/
Summaries are generated and may contain mistakes; the official description above is the record.