# CVE-2019-15541: Denial of service in n/a

> Attackers can cause a denial of service in the rustls example server by preventing client writability, leading to an infinite event loop.

- **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:** No
- **Published:** 26 Aug 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-888v-c6vc-wh7r

## What is CVE-2019-15541?

CVE-2019-15541 is a high-severity denial of service vulnerability in n/a, published on 26 Aug 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

rustls-mio/examples/tlsserver.rs in the rustls crate before 0.16.0 for Rust allows attackers to cause a denial of service (loop of conn_event and ready) by arranging for a client to never be writable.

Weakness: CWE-88 (Improper Neutralization of Argument Delimiters in a Command)

## Which versions are affected by CVE-2019-15541?

It affects 1 product.


Products: Rustls Project Rustls.

## How do I fix CVE-2019-15541?

No fix has been published for CVE-2019-15541 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-15541 being exploited?

There is no known exploitation of CVE-2019-15541 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-11738](https://insights.sbomify.com/CVE-2024-11738/): Rustls: rustls network-reachable panic in `acceptor::accept` (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-15541 and fix it if it is affected.

What it is: CVE-2019-15541 is a high-severity denial of service vulnerability in n/a, published on 26 Aug 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-2019-15541 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-2019-15541/ (Markdown: https://insights.sbomify.com/CVE-2019-15541/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-15541
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-15541
- OSV: https://osv.dev/vulnerability/CVE-2019-15541

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-15541/
Summaries are generated and may contain mistakes; the official description above is the record.