rustdesk-client RustDesk Client up to 1.4.5 src/client.Rs hash_password authentication replay

Summaryinfo

A vulnerability has been found in rustdesk-client RustDesk Client up to 1.4.5 and classified as critical. Affected is the function hash_password of the file src/client.Rs. The manipulation leads to authentication replay. This vulnerability is referenced as CVE-2026-30789. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in rustdesk-client RustDesk Client up to 1.4.5 and classified as critical. This issue affects the function hash_password of the file src/client.Rs. The manipulation with an unknown input leads to a authentication replay vulnerability. Using CWE to declare the problem leads to CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Authentication Bypass by Capture-replay, Use of Password Hash With Insufficient Computational Effort vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Client login, peer authentication modules) allows Reusing Session IDs (aka Session Replay). This vulnerability is associated with program files src/client.Rs and program routines hash_password(), login proof construction. This issue affects RustDesk Client: through 1.4.5.

The weakness was published by Erez Kalman. The advisory is shared at rustdesk.com. The identification of this vulnerability is CVE-2026-30789 since 03/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/26/2026). MITRE ATT&CK project uses the attack technique T1040 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• rustdesk-client

Name

• RustDesk Client

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5

CPE 2.3info

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CPE 2.2info

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