CVE-2026-64621 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-64621CRITICAL

FreeRDP before 3.28.0 Double-Free via selectedmonitors

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   H   H   H    9.3   .0030   23.1     —

AFFECTED
  Product  Versions     Fixed
  FreeRDP  unspecified  3.28.0

TIMELINE
  Jul 20  EXPLOIT PUBLISHED — CVE-2026-64621 (FreeRDP). Public exploit reference added.
  Jul 20  Reserved by VulnCheck
  Jul 20  Published (CNA: VulnCheck)
  Jul 28  EXPLOIT PUBLISHED — CVE-2026-64621 (FreeRDP). Public exploit reference added.

CWE-415 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

FreeRDP before 3.28.0 (affected 3.x through 3.27.1) contains a double-free vulnerability in freerdp_client_rdp_file_apply_to_settings() (client/common/file.c) when parsing the selectedmonitors field of a .rdp connection file. The MonitorIds array is allocated through the settings object, and a raw non-owning pointer to it is freed on the strtoul error path without clearing settings->MonitorIds, leaving it dangling; at teardown freerdp_settings_free() frees the same buffer again. An attacker who convinces a victim to open a crafted .rdp file with oversized monitor tokens can trigger a size-controlled double-free in any FreeRDP CLI client (xfreerdp/sdl-freerdp/wlfreerdp) in the default configuration.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 20, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-64621 (FreeRDP). Public exploit reference added.
July 20, 2026	Reserved	Reserved by VulnCheck
July 20, 2026	Published	Published (CNA: VulnCheck)
July 28, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-64621 (FreeRDP). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FreeRDP	FreeRDP	—	—	3.28.0

Weaknesses

CWE-415

References (3)

https://github.com/FreeRDP/FreeRDP/commit/1f7a716d39b5605bb8a83b0c3c97a6ce386609ef [Patch]
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hc [Exploit, Mitigation, Vendor Advisory]
https://www.vulncheck.com/advisories/freerdp-before-double-free-via-selectedmonitors [Patch, Third Party Advisory]

Authoritative record: CVE-2026-64621 at cve.org

Vendors: freerdp

Weaknesses: CWE-415

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-64621 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.