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TI-2020-03533 Aliases CVE-2020-4044

Local users can perform a buffer overflow attack against the xrdp-sesman service and then impersonate it

Priority LOW 39CWE-121Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

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.

Why it matters now

EPSS 0.02329 83rd percentileScored 2026-11-07
Fix Fixed xrdp (neutrinolabs): 0.9.13.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
neutrinolabsxrdpbefore 0.9.13.10.9.13.1Patch availableCNA
  • xrdp Vendorneutrinolabs Affected before 0.9.13.1 Fixed in 0.9.13.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:neutrinolabs:xrdp:*:*:*:*:*:*:*:*before 0.9.13.1Vulnerableneutrinolabs
  • cpe:2.3:a:neutrinolabs:xrdp:*:*:*:*:*:*:*:* Versions before 0.9.13.1 Vulnerable ·neutrinolabs

Remediation

  • Fix · CNA xrdp (neutrinolabs) Fixed in 0.9.13.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-4044

References

Patch 1

Advisory 5

Other 1

  • TI-2025-42163 xrdp improperly checks bounds of domain string length, which leads to Stack-based Buffer Overflow CVSS 3.1CRITICAL 9.8
  • TI-2026-29860 xrdp: lib_palette_update Heap Buffer Overflow & RCE CVSS 3.1CRITICAL 9.8
  • TI-2022-07540 Buffer Overflow in xrdp CVSS 3.1CRITICAL 9.8
  • TI-2022-07539 Buffer Overflow occurs in xrdp CVSS 3.1CRITICAL 9.8
  • TI-2022-07538 Out of Bound Write in xrdp CVSS 3.1CRITICAL 9.8
  • TI-2022-07537 Buffer Overflow in xrdp CVSS 3.1CRITICAL 9.8
See all 36 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences