# CVE-2019-3994: Use after free in ELOG

> A remote unauthenticated attacker can crash the ELOG server by sending multiple HTTP POST requests, causing a use-after-free condition.

- **Severity:** High 7.5 (`CVSS:3.1/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:** No
- **Published:** 17 Dec 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-8cv3-rqqw-vw5m, UBUNTU-CVE-2019-3994

## What is CVE-2019-3994?

CVE-2019-3994 is a high-severity use after free vulnerability in Fedoraproject Fedora, published on 17 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ELOG 3.1.4-57bea22 and below is affected by a denial of service vulnerability due to a use after free. A remote unauthenticated attacker can crash the ELOG server by sending multiple HTTP POST requests which causes the ELOG function retrieve_url() to use a freed variable.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2019-3994?

It affects 2 products.


Products: Elog Project Elog, Fedoraproject Fedora.

## How do I fix CVE-2019-3994?

No fix has been published for CVE-2019-3994 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3994 being exploited?

There is no known exploitation of CVE-2019-3994 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2025-64348](https://insights.sbomify.com/CVE-2025-64348/): ELOG configuration file authorization bypass (critical 9.3)
- [CVE-2025-64349](https://insights.sbomify.com/CVE-2025-64349/): ELOG user profile missing authorization (high 8.7)
- [CVE-2025-62618](https://insights.sbomify.com/CVE-2025-62618/): ELOG file upload stored XSS (high 8.6)
- [CVE-2019-3992](https://insights.sbomify.com/CVE-2019-3992/): Information disclosure in ELOG (high 7.5)
- [CVE-2019-3993](https://insights.sbomify.com/CVE-2019-3993/): Information disclosure in ELOG (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3994 and fix it if it is affected.

What it is: CVE-2019-3994 is a high-severity use after free vulnerability in Fedoraproject Fedora, published on 17 Dec 2019. 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-2019-3994 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2019-3994/ (Markdown: https://insights.sbomify.com/CVE-2019-3994/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3994
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3994
- OSV: https://osv.dev/vulnerability/CVE-2019-3994

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3994/
Summaries are generated and may contain mistakes; the official description above is the record.