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Fencer Vulns
high 7.3

CVE-2026-64621 json

FreeRDP before 3.28.0 Double-Free via selectedmonitors

published 2026-07-20 3 mo ago modified 2026-07-28 3 mo ago also EUVD-2026-45936

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

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.

Patch / fix

  • FreeRDP FreeRDP 3.28.0
  • freerdp3 Debian 14 3.28.0+dfsg-1

debian advisories DEBIAN-CVE-2026-64621

  • freerdp3 Ubuntu 24.04 LTS 3.30.0+dfsg-0ubuntu0.24.04.1
  • freerdp3 Ubuntu 26.04 LTS 3.30.0+dfsg-0ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-64621

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • freerdp RHEL 10.2 2:3.10.3-12.el10_2.8
  • libwinpr RHEL 10.2 2:3.10.3-12.el10_2.8
  • freerdp-libs RHEL 10.2 2:3.10.3-12.el10_2.8
  • freerdp-server RHEL 10.2 2:3.10.3-12.el10_2.8
  • freerdp enterprise linux eus 10.0 2:3.10.3-3.el10_0.11
  • libwinpr enterprise linux eus 10.0 2:3.10.3-3.el10_0.11
  • freerdp-libs enterprise linux eus 10.0 2:3.10.3-3.el10_0.11
  • freerdp-server enterprise linux eus 10.0 2:3.10.3-3.el10_0.11

red hat advisories RHSA-2026:58711RHSA-2026:54486

  • freerdp AlmaLinux 10 2:3.10.3-12.el10_2.8
  • libwinpr AlmaLinux 10 2:3.10.3-12.el10_2.8
  • freerdp-libs AlmaLinux 10 2:3.10.3-12.el10_2.8
  • freerdp-server AlmaLinux 10 2:3.10.3-12.el10_2.8

almalinux advisories ALSA-2026:54486

  • freerdp Rocky Linux 10 2:3.10.3-12.el10_2.8

rocky linux advisories RLSA-2026:54486

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-64621 updated cvss 7.3

FreeRDP: FreeRDP: Double-free vulnerability via crafted .rdp file leading to potential remote code execution

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins
    affected: workaround, no fix planned “The vulnerability is triggered by opening a malicious `.rdp` file. Users should exercise caution and avoid opening `.rdp` files from untrusted sources.”
  • Red Hat Enterprise Linux AppStream (v. 10) freerdp 3.10.3-12.el10_2.8, libwinpr 3.10.3-12.el10_2.8, freerdp-libs 3.10.3-12.el10_2.8
    fixed: vendor fix “The vulnerability is triggered by opening a malicious `.rdp` file. Users should exercise caution and avoid opening `.rdp` files from untrusted sources.” RHSA-2026:54486
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp 3.10.3-3.el10_0.11, libwinpr 3.10.3-3.el10_0.11, freerdp-libs 3.10.3-3.el10_0.11
    fixed: vendor fix “The vulnerability is triggered by opening a malicious `.rdp` file. Users should exercise caution and avoid opening `.rdp` files from untrusted sources.” RHSA-2026:58711
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-server 3.10.3-12.el10_2.8
    fixed: vendor fix “The vulnerability is triggered by opening a malicious `.rdp` file. Users should exercise caution and avoid opening `.rdp` files from untrusted sources.” RHSA-2026:54486
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-server 3.10.3-3.el10_0.11
    fixed: vendor fix “The vulnerability is triggered by opening a malicious `.rdp` file. Users should exercise caution and avoid opening `.rdp` files from untrusted sources.” RHSA-2026:58711
  • Red Hat Enterprise Linux 7 freerdp, libwinpr, freerdp-libs, freerdp-plugins Red Hat Enterprise Linux 8 freerdp, libwinpr, freerdp-libs Red Hat Enterprise Linux 9 freerdp, libwinpr, freerdp-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hc referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
CNA 4.0 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • FreeRDP FreeRDP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.