THREATPORT/VULNERABILITY/CVE-2026-44420
HIGH SEVERITY

CVE-2026-44420

Freerdp vulnerability

CVSS
8.8
EPSS
3.5%
EPSS pct
88th
Exploited
No known
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0.
Affected vendor
Freerdp
Affected product
Freerdp
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-122 — Heap-based Buffer Overflow
  • CWE-131 — Incorrect Calculation of Buffer Size
Published
2026-05-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2026-44420

  • Confirm whether Freerdp Freerdp is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-44420.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-44420

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