Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-67294— FreeRDP before 3.29.0 TLS Certificate EKU Bypass

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.29.0之前版本存在加密问题漏洞，该漏洞源于对等证书的扩展密钥用途验证不当，在x509_utils_verify()中当服务器用途验证失败时回退到客户端用途和任意用途验证，可能导致仅用于客户端身份验证的受信任证书被接受为RDP服务器证书，从而绕过服务器证书目的验证。

CVSS 5.9 · Medium EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.29.0 affected
3.29.0 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-67294

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
FreeRDP before 3.29.0 TLS Certificate EKU Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509_utils_verify(), when server-purpose (X509_PURPOSE_SSL_SERVER) verification fails, the code falls back to client-purpose and any-purpose verification, so a trusted, hostname-matching certificate valid only for clientAuth can be accepted as the RDP server certificate. In environments relying on EKU separation between client and server certificates, this allows a clientAuth-only certificate issued by a trusted CA to bypass server certificate purpose validation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.29.0之前版本存在加密问题漏洞，该漏洞源于对等证书的扩展密钥用途验证不当，在x509_utils_verify()中当服务器用途验证失败时回退到客户端用途和任意用途验证，可能导致仅用于客户端身份验证的受信任证书被接受为RDP服务器证书，从而绕过服务器证书目的验证。
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 ~ 3.29.0 -

II. Public POCs for CVE-2026-67294

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-67294

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-67294 (1)

Vendor Advisories for CVE-2026-67294 (2)

Same Patch Batch · FreeRDP · 2026-08-01 · 21 CVEs total

CVE-2026-66402 9.8 CRITICAL FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
CVE-2026-67289 9.8 CRITICAL FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
CVE-2026-67305 9.4 CRITICAL FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
CVE-2026-67291 7.5 HIGH FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD
CVE-2026-67304 7.5 HIGH FreeRDP before 3.29.0 NULL Dereference via smartcard cleanup
CVE-2026-67297 7.5 HIGH FreeRDP before 3.29.0 Resource Exhaustion via chunked HTTP response
CVE-2026-67301 7.5 HIGH FreeRDP before 3.29.0 Out-of-bounds Read via Polygon async message-proxy
CVE-2026-67290 7.5 HIGH FreeRDP before 3.29.0 Heap Out-of-Bounds Read via TSMF
CVE-2026-67296 7.5 HIGH FreeRDP before 3.29.0 Denial of Service via RDPEI PDU
CVE-2026-67299 7.5 HIGH FreeRDP before 3.29.0 Use-After-Free via WindowIcon async message
CVE-2026-67300 7.5 HIGH FreeRDP before 3.29.0 Use-After-Free via async message proxy
CVE-2026-67288 7.5 HIGH FreeRDP before 3.29.0 Denial of Service via smartcard cache
CVE-2026-67298 7.5 HIGH FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength Underflow
CVE-2026-67292 6.5 MEDIUM FreeRDP before 3.29.0 WebSocket Ping Buffer Over-disclosure
CVE-2026-67295 6.3 MEDIUM FreeRDP before 3.29.0 Path Traversal via drive redirection
CVE-2026-67306 5.4 MEDIUM FreeRDP before 3.29.0 Out-of-Bounds Read via Planar RLE
CVE-2026-67303 4.3 MEDIUM FreeRDP before 3.29.0 Denial of Service via serial DeviceControl
CVE-2026-67302 4.3 MEDIUM FreeRDP rdpecam StartStreamsRequest divide-by-zero denial of service
CVE-2026-67293 4.2 MEDIUM FreeRDP before 3.29.0 Improper Certificate Hostname Validation
CVE-2026-66401 2.1 LOW FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-295

V. Comments for CVE-2026-67294

No comments yet

Leave a comment