# CVE-2017-3305: Auth bypass in MySQL Server

> A flaw in MySQL Server allows attackers to hijack user authentication via man-in-the-middle attacks, leading to unauthorized data access.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Apr 2017
- **Updated:** 7 Oct 2024
- **Also known as:** GHSA-7568-gxg7-r8h9, UBUNTU-CVE-2017-3305

## What is CVE-2017-3305?

CVE-2017-3305 is a medium-severity authentication bypass vulnerability in Debian Debian Linux, published on 24 Apr 2017. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: C API). Supported versions that are affected are 5.5.55 and earlier and 5.6.35 and earlier. Difficult to exploit vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all MySQL Server accessible data. CVSS 3.0 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N). NOTE: the previous information is from the April 2017 CPU. Oracle has not commented on third-party claims that this issue allows man-in-the-middle attackers to hijack the authentication of users by leveraging incorrect ordering of security parameter verification in a client, aka, "The Riddle".

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information)

## Which versions are affected by CVE-2017-3305?

It affects 2 products.


Products: Debian Debian Linux, Oracle Mysql.

## How do I fix CVE-2017-3305?

Apply the vendor's patch.

## Is CVE-2017-3305 being exploited?

There is no known exploitation of CVE-2017-3305 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-3305 and fix it if it is affected.

What it is: CVE-2017-3305 is a medium-severity authentication bypass vulnerability in Debian Debian Linux, published on 24 Apr 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-3305 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2017-3305/ (Markdown: https://insights.sbomify.com/CVE-2017-3305/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-3305
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-3305
- OSV: https://osv.dev/vulnerability/CVE-2017-3305

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-3305/
Summaries are generated and may contain mistakes; the official description above is the record.