# CVE-2017-2625: libxdmcp6: It was discovered that libXdmcp before 1.1.2 including used weak entropy to generate session keys

CVE-2017-2625 is fixed in libxdmcp6 on 1 platform by libxdmcp6 1:1.1.2-3 (version 1:1.1.2-3), released July 27, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2017-2625
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0053
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 27, 2018

## Description

It was discovered that libXdmcp before 1.1.2 including used weak entropy to generate session keys. On a multi-user system using xdmcp, a local attacker could potentially use information available from the process list to brute force the key, allowing them to hijack other users' sessions.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libxdmcp6 Ubuntu 18.04.6 LTS (bionic) | 1:1.1.2-3 | [libxdmcp6 1:1.1.2-3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxdmcp6-1-1.1.2-3.md) | Jul 27, 2018 |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo