HighFix available

xrdp — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2020-4044

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.

Products: xrdp
Affected versions: Not specified
Fixed versions: 0.9.12-1.1
CVEs: CVE-2020-4044
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 14:02 UTC · Revision 1

Source evidence

DEBIAN-CVE-2020-4044

core-osv · Original source

Published 30 Jun 2020, 16:15 UTC

osv:DEBIAN-CVE-2020-4044

xrdp

Fixed versions: 0.9.12-1.1

xrdp

Fixed versions: 0.9.12-1.1

xrdp

Fixed versions: 0.9.12-1.1

Complete source record

{
  "id": "7685498b2a29a7f7ece4a184db5f7c9147ab16fd98b87556901486cf8bd7c0e2",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-4044",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2020-4044",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2020-4044",
    "products": [
      {
        "name": {
          "value": "xrdp",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.9.12-1.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "xrdp",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.9.12-1.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "xrdp",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.9.12-1.1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2020-4044",
      "aliases": [
        "DEBIAN-CVE-2020-4044"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.9.12-1.1"
                }
              ]
            }
          ],
          "package": {
            "name": "xrdp",
            "purl": "pkg:deb/debian/xrdp?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-4044.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.9.12-1.1"
                }
              ]
            }
          ],
          "package": {
            "name": "xrdp",
            "purl": "pkg:deb/debian/xrdp?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-4044.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.9.12-1.1"
                }
              ]
            }
          ],
          "package": {
            "name": "xrdp",
            "purl": "pkg:deb/debian/xrdp?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-4044.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T12:02:49.423041220Z",
      "provider": "osv",
      "upstream": [
        "CVE-2020-4044"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2020-4044"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2020-4044",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 453080,
  "published_at": "2020-06-30T16:15:16.203+00:00"
}