# CVE-2020-4044: xorgxrdp: The xrdp-sesman service before version 0.9.13.1 can be crashed by connecting over port 3350 and supplying a malicious...

CVE-2020-4044 is fixed in 3 products on 1 platform, first by xorgxrdp 0.9.5-2ubuntu0.1~esm1, released June 30, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-4044
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0233
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 30, 2020

## Description

The xrdp-sesman service before version 0.9.13.1 can be crashed by connecting over port 3350 and supplying a malicious payload. Once the xrdp-sesman process is dead, an unprivileged attacker on the server could then proceed to start their own imposter sesman service listening on port 3350. This will allow them to capture any user credentials that are submitted to XRDP and approve or reject arbitrary login credentials. For xorgxrdp sessions in particular, this allows an unauthorized user to hijack an existing session. This is a buffer overflow attack, so there may be a risk of arbitrary code execution as well.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xorgxrdp Ubuntu 18.04.6 LTS (bionic) | 0.9.5-2ubuntu0.1~esm1 | [xorgxrdp 0.9.5-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xorgxrdp-0.9.5-2ubuntu0.1-esm1.md) | Jun 30, 2020 |
| Linux | xrdp Ubuntu 18.04.6 LTS (bionic) | 0.9.5-2ubuntu0.1~esm1 | [xrdp 0.9.5-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xrdp-0.9.5-2ubuntu0.1-esm1.md) | Jun 30, 2020 |
| Linux | xrdp Ubuntu 20.04 LTS (focal) | 0.9.12-1ubuntu0.1 | [xrdp 0.9.12-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xrdp-0.9.12-1ubuntu0.1.md) | Jun 30, 2020 |
| Linux | xrdp-pulseaudio-installer Ubuntu 18.04.6 LTS (bionic) | 0.9.5-2ubuntu0.1~esm1 | [xrdp-pulseaudio-installer 0.9.5-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xrdp-pulseaudio-installer-0.9.5-2ubuntu0.1-esm1.md) | Jun 30, 2020 |

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Data as of 2026-11-07T18:46:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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