CVE-2026-30795
Published: 05 March 2026
Summary
CVE-2026-30795 is a high-severity Cleartext Transmission of Sensitive Information (CWE-319) vulnerability in Rustdesk Rustdesk. Its CVSS base score is 8.7 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Network Sniffing (T1040); ranked at the 18.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SC-13 (Cryptographic Protection) and SC-8 (Transmission Confidentiality and Integrity).
Deeper analysis
CVE-2026-30795 is a Cleartext Transmission of Sensitive Information vulnerability (CWE-319) in the RustDesk Client (rustdesk-client), affecting versions through 1.4.5 on Windows, macOS, Linux, iOS, and Android. The flaw occurs in the Heartbeat sync loop modules, specifically within the program file src/hbbs_http/sync.rs and the Heartbeat JSON payload construction routines involving the preset-address-book-password, enabling sniffing attacks on transmitted data.
The vulnerability carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), indicating it can be exploited remotely over the network with low complexity, no privileges, and no user interaction. Unauthenticated attackers positioned to sniff network traffic can intercept cleartext sensitive information, such as passwords embedded in heartbeat JSON payloads, leading to high confidentiality impact without affecting integrity or availability.
Advisories and patch information are available in the referenced sources, including a detailed pub document at https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub, the RustDesk GitHub repository at https://github.com/rustdesk/rustdesk, and https://www.vulsec.org/. Security practitioners should review these for upgrade guidance to versions beyond 1.4.5 and any interim mitigations.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9829
Vulnerability details
Cleartext Transmission of Sensitive Information vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Heartbeat sync loop modules) allows Sniffing Attacks. This vulnerability is associated with program files src/hbbs_http/sync.Rs and program routines Heartbeat JSON payload construction (preset-address-book-password).…
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This issue affects RustDesk Client: through 1.4.5.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Cleartext transmission of credentials (passwords) in heartbeat JSON payloads directly enables passive network sniffing to capture authentication material (T1040).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires protection of the confidentiality of transmitted information, directly preventing sniffing attacks on cleartext sensitive data like preset-address-book-password in RustDesk heartbeat JSON payloads.
Mandates timely remediation of system flaws, ensuring vulnerabilities like cleartext transmission in RustDesk client through version 1.4.5 are patched to eliminate the exposure.
Implements cryptographic mechanisms to protect confidentiality of information during transmission, mitigating the cleartext heartbeat sync vulnerability in src/hbbs_http/sync.rs.