Zitadel up to 2.71.17/3.4.2/4.5.x excessive authentication

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Zitadel up to 2.71.17/3.4.2/4.5.x. This impacts an unknown function. Performing a manipulation results in excessive authentication. This vulnerability is identified as CVE-2025-64102. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Zitadel up to 2.71.17/3.4.2/4.5.x. This affects an unknown functionality. The manipulation with an unknown input leads to a excessive authentication vulnerability. CWE is classifying the issue as CWE-307. The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Zitadel is open-source identity infrastructure software. Prior to 4.6.0, 3.4.3, and 2.71.18, an attacker can perform an online brute-force attack on OTP, TOTP, and passwords. While Zitadel allows preventing online brute force attacks in scenarios like TOTP, Email OTP, or passwords using a lockout mechanism. The mechanism is not enabled by default and can cause a denial of service for the corresponding user if enabled. Additionally, the mitigation strategies were not fully implemented in the more recent resource-based APIs. This vulnerability is fixed in 4.6.0, 3.4.3, and 2.71.18.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2025-64102 since 10/27/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1110.001 according to MITRE ATT&CK.

Upgrading to version 2.71.18, 3.4.3 or 4.6.0 eliminates this vulnerability. Applying the patch b8db8cdf9cc8ea13f461758aef12457f8b7d972a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Zitadel

Version

• 2.71.0
• 2.71.1
• 2.71.2
• 2.71.3
• 2.71.4
• 2.71.5
• 2.71.6
• 2.71.7
• 2.71.8
• 2.71.9
• 2.71.10
• 2.71.11
• 2.71.12
• 2.71.13
• 2.71.14
• 2.71.15
• 2.71.16
• 2.71.17
• 3.4.0
• 3.4.1
• 3.4.2
• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5

License

• open-source

Website

• Product: https://github.com/zitadel/zitadel/

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