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Security advisory

Type: advisorySources: OSVCVE: 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
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-4044
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 11:28 UTC · Revision 1

Source evidence

CVE-2020-4044

core-osv · Original source

Published 30 Jun 2020, 16:15 UTC

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.

osv:CVE-2020-4044
Complete source record
{
  "id": "cde765dda6bb0ddd0c934f37d0c219538e7076dd78a75c2982552758dc9c0955",
  "url": "https://osv.dev/vulnerability/CVE-2020-4044",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "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:CVE-2020-4044",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-4044",
      "aliases": [
        "CVE-2020-4044",
        "GHSA-j9fv-6fwf-p3g4"
      ],
      "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": [
            {
              "repo": "https://github.com/neutrinolabs/xrdp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a9d4130d20c15dd0815c11660006538cf4831488"
                },
                {
                  "fixed": "0c791d073d0eb344ee7aaafd221513dc9226762c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:neutrinolabs:xrdp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.9.13.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0c791d073d0eb344ee7aaafd221513dc9226762c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a9d4130d20c15dd0815c11660006538cf4831488"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.9.13.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.9.13",
            "v0.9.12",
            "v0.9.11",
            "v0.9.10",
            "v0.9.9",
            "v0.9.8",
            "v0.9.7",
            "v0.9.6",
            "v0.9.5",
            "v0.9.4",
            "v0.9.3.1",
            "v0.9.4.rc1",
            "v0.9.3",
            "v0.9.3.rc1",
            "v0.9.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-4044.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:21.785138435Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2020/08/msg00015.html",
        "https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.13.1",
        "https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4",
        "https://www.debian.org/security/2020/dsa-4737",
        "https://github.com/neutrinolabs/xrdp/commit/0c791d073d0eb344ee7aaafd221513dc9226762c"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-4044",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385179,
  "published_at": "2020-06-30T16:15:16.203+00:00"
}