RustDesk HTTP Client Silently Accepts Invalid TLS Certificates After Handshake Failure
Summary
| CVE | CVE-2026-30794 |
|---|---|
| State | PUBLISHED |
| Assigner | VULSec |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-05 16:16:20 UTC |
| Updated | 2026-06-22 10:16:21 UTC |
| Description | Improper Certificate Validation vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (HTTP API client, TLS transport modules) allows Adversary in the Middle (AiTM). This vulnerability is associated with program files src/hbbs_http/http_client.Rs and program routines TLS retry with danger_accept_invalid_certs(true). This issue affects RustDesk Client: through 1.4.8. |
Risk And Classification
Primary CVSS: v4.0 9.1 CRITICAL from 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/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
Problem Types: CWE-295 | CWE-295 CWE-295 Improper Certificate Validation
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe | Secondary | 9.1 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 9.1 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Primary | 8.1 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/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
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Apple | Iphone Os | - | All | All | All |
| Operating System | Apple | Macos | - | All | All | All |
| Operating System | Android | - | All | All | All | |
| Operating System | Linux | Linux Kernel | - | All | All | All |
| Operating System | Microsoft | Windows | - | All | All | All |
| Application | Rustdesk | Rustdesk | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Rustdesk-client | RustDesk Client | affected 1.4.8 custom | Windows, MacOS, Linux, iOS, Android |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/rustdesk/rustdesk | 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe | github.com | Product |
| docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI... | 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe | docs.google.com | Exploit, Third Party Advisory |
| www.vulsec.org | 2fdefc65-d750-4b8d-96ee-6e2c0c42dbfe | www.vulsec.org | Not Applicable |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Erez Kalman (en)
CNA: Erez Kalman (en)
Additional Advisory Data
Solutions
CNA: Remove automatic fallback. Treat TLS handshake failures as fatal.
Workarounds
CNA: Ensure network path to API server cannot be intercepted (VPN, direct link)
Exploits
CNA: PoC available. Trivially exploitable.