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CVE-2026-64621— FreeRDP before 3.28.0 Double-Free via selectedmonitors

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP是FreeRDP团队开源的一款开源的远程桌面协议(RDP)的实现。 FreeRDP 3.28.0之前版本存在资源管理错误漏洞，该漏洞源于freerdp_client_rdp_file_apply_to_settings()函数在解析.rdp连接文件的selectedmonitors字段时存在双重释放，可能导致攻击者通过诱使受害者打开特制的.rdp文件触发大小可控的双重释放。

CVSS 7.3 · High EPSS 0.36% · P28

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.28.0 affected
3.28.0 unaffected
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I. Basic Information for CVE-2026-64621

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.28.0 Double-Free via selectedmonitors
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队开源的一款开源的远程桌面协议(RDP)的实现。 FreeRDP 3.28.0之前版本存在资源管理错误漏洞，该漏洞源于freerdp_client_rdp_file_apply_to_settings()函数在解析.rdp连接文件的selectedmonitors字段时存在双重释放，可能导致攻击者通过诱使受害者打开特制的.rdp文件触发大小可控的双重释放。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 0 ~ 3.28.0 -

II. Public POCs for CVE-2026-64621

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 52022 chars
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III. Intelligence Information for CVE-2026-64621

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Vendor Advisories for CVE-2026-64621 (1)

Other References for CVE-2026-64621 (1)

Same Patch Batch · FreeRDP · 2026-07-20 · 3 CVEs total

CVE-2026-64620 9.8 CRITICAL FreeRDP before 3.28.0 Heap Buffer Overflow via crypto_rsa_common
CVE-2026-64624 7.8 HIGH FreeRDP RDP File Parser Remote Code Execution via CLI Options

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-415

V. Comments for CVE-2026-64621

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