# CVE-2014-3509: Race condition in n/a

> Remote attackers can cause client application crashes via a race condition in OpenSSL when multithreading and session resumption are enabled.

- **Severity:** Medium 6.8 (`AV:N/AC:M/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 13 Aug 2014
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2014-3509, GHSA-6353-qghw-q8mp, UBUNTU-CVE-2014-3509

## What is CVE-2014-3509?

CVE-2014-3509 is a medium-severity vulnerability in Openssl Openssl, published on 13 Aug 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Race condition in the ssl_parse_serverhello_tlsext function in t1_lib.c in OpenSSL 1.0.0 before 1.0.0n and 1.0.1 before 1.0.1i, when multithreading and session resumption are used, allows remote SSL servers to cause a denial of service (memory overwrite and client application crash) or possibly have unspecified other impact by sending Elliptic Curve (EC) Supported Point Formats Extension data.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2014-3509?

It affects 1 product.


Products: Openssl Openssl.

## How do I fix CVE-2014-3509?

Upgrade to a fixed version.

## Is CVE-2014-3509 being exploited?

There is no known exploitation of CVE-2014-3509 in the wild and no public exploit code.

## Other vulnerabilities in Openssl Openssl

- [CVE-2009-3245](https://insights.sbomify.com/CVE-2009-3245/): Null dereference in n/a (critical 10.0)
- [CVE-2006-3738](https://insights.sbomify.com/CVE-2006-3738/): Memory corruption in n/a (critical 10.0)
- [CVE-2026-63073](https://insights.sbomify.com/CVE-2026-63073/): Untrusted Sender DN Used as Format String in CMP Response Validation (critical 9.8)
- [CVE-2016-6309](https://insights.sbomify.com/CVE-2016-6309/): Use after free in n/a (critical 9.8)
- [CVE-2016-0799](https://insights.sbomify.com/CVE-2016-0799/): Integer overflow in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2014-3509 and fix it if it is affected.

What it is: CVE-2014-3509 is a medium-severity vulnerability in Openssl Openssl, published on 13 Aug 2014. 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-2014-3509 in the wild and no public exploit code.

Affected product: Openssl Openssl. 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-2014-3509/ (Markdown: https://insights.sbomify.com/CVE-2014-3509/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2014-3509
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2014-3509
- OSV: https://osv.dev/vulnerability/CVE-2014-3509

---
From sbomify Insights: https://insights.sbomify.com/CVE-2014-3509/
Summaries are generated and may contain mistakes; the official description above is the record.