# CVE-2015-7744: Weak cryptography in n/a

> Remote attackers can recover private RSA keys via Lenstra attack if ephemeral key exchange is enabled without low memory optimizations.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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:** 22 Jan 2016
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-7744, GHSA-f7wf-fgwg-64px, UBUNTU-CVE-2015-7744

## What is CVE-2015-7744?

CVE-2015-7744 is a medium-severity vulnerability in Mariadb Mariadb, published on 22 Jan 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

wolfSSL (formerly CyaSSL) before 3.6.8 does not properly handle faults associated with the Chinese Remainder Theorem (CRT) process when allowing ephemeral key exchange without low memory optimizations on a server, which makes it easier for remote attackers to obtain private RSA keys by capturing TLS handshakes, aka a Lenstra attack.

## Which versions are affected by CVE-2015-7744?

It affects 4 products.


Products: Mariadb Mariadb, Opensuse Leap, Opensuse Opensuse, Wolfssl Wolfssl.

## How do I fix CVE-2015-7744?

Upgrade to a fixed version.

## Is CVE-2015-7744 being exploited?

There is no known exploitation of CVE-2015-7744 in the wild and no public exploit code.

## Other vulnerabilities in Mariadb Mariadb

- [CVE-2026-49261](https://insights.sbomify.com/CVE-2026-49261/): MariaDB server has unsafe parameter handling in `wsrep_notify_cmd` (critical 10.0)
- [CVE-2026-85746](https://insights.sbomify.com/CVE-2026-85746/): MariaDB: Out-of-bound buffer write on in `ST_AsText` of nested GeometryCollections (critical 9.9)
- [CVE-2026-85748](https://insights.sbomify.com/CVE-2026-85748/): MariaDB: Use-after-free with a large number of SYS_REFCURSOR's (critical 9.9)
- [CVE-2026-92262](https://insights.sbomify.com/CVE-2026-92262/): MariaDB: Numerous issues caused by historical #mysql50# tablename encoding bypass. (critical 9.9)
- [CVE-2023-26785](https://insights.sbomify.com/CVE-2023-26785/): Code injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-7744 and fix it if it is affected.

What it is: CVE-2015-7744 is a medium-severity vulnerability in Mariadb Mariadb, published on 22 Jan 2016. 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-2015-7744 in the wild and no public exploit code.

Affected product: Mariadb Mariadb. 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-2015-7744/ (Markdown: https://insights.sbomify.com/CVE-2015-7744/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-7744
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-7744
- OSV: https://osv.dev/vulnerability/CVE-2015-7744

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-7744/
Summaries are generated and may contain mistakes; the official description above is the record.