# CVE-2019-19886: Denial of service in n/a

> An attacker can cause a denial of service in ModSecurity by sending a large volume of crafted requests, leading to server unresponsiveness.

- **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:** Yes
- **Published:** 21 Jan 2020
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-19886, GHSA-p5f3-2x3f-r9c7

## What is CVE-2019-19886?

CVE-2019-19886 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 21 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Trustwave ModSecurity 3.0.0 through 3.0.3 allows an attacker to send crafted requests that may, when sent quickly in large volumes, lead to the server becoming slow or unresponsive (Denial of Service) because of a flaw in Transaction::addRequestHeader in transaction.cc.

Weakness: CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2019-19886?

It affects 2 products.


Products: Fedoraproject Fedora, Owasp Modsecurity.

## How do I fix CVE-2019-19886?

Upgrade to a fixed version.

## Is CVE-2019-19886 being exploited?

There is no known exploitation of CVE-2019-19886 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-19886 and fix it if it is affected.

What it is: CVE-2019-19886 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 21 Jan 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-2019-19886 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-2019-19886/ (Markdown: https://insights.sbomify.com/CVE-2019-19886/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-19886
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-19886
- OSV: https://osv.dev/vulnerability/CVE-2019-19886

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-19886/
Summaries are generated and may contain mistakes; the official description above is the record.