How severe is CVE-2025-64102?

CVE-2025-64102 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-64102 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-64102?

CVE-2025-64102 affects Zitadel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-64102?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-64102 have an EU (EUVD) identifier?

Yes. CVE-2025-64102 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36697.

When was CVE-2025-64102 published?

CVE-2025-64102 was published on 2025-10-29 and last updated on 2026-06-17.

CVE-2025-64102

CVE-2025-64102 is a critical-severity vulnerability in Zitadel with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-307.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 7.7
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-36697
Weakness: CWE-307
Affected product: Zitadel
Published: 2025-10-29
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-64102?: 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.
How severe is CVE-2025-64102?: CVE-2025-64102 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-64102 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-64102?: CVE-2025-64102 affects Zitadel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-64102?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-64102 have an EU (EUVD) identifier?: Yes. CVE-2025-64102 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36697.
When was CVE-2025-64102 published?: CVE-2025-64102 was published on 2025-10-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*

More vulnerabilities in Zitadel

CVE-2025-64717 — Critical (CVSS 9.8): ZITADEL is an open source identity management platform. Starting in version 2.50.0 and prior to versions 2.71.19,…
CVE-2025-64103 — Critical (CVSS 9.8): Starting from 2.53.6, 2.54.3, and 2.55.0, Zitadel only required multi factor authentication in case the login policy…
CVE-2026-29191 — Critical (CVSS 9.3): ZITADEL is an open source identity management platform. From version 4.0.0 to 4.11.1, a vulnerability in Zitadel's…
CVE-2025-67494 — Critical (CVSS 9.3): ZITADEL is an open-source identity infrastructure tool. Versions 4.7.0 and below are vulnerable to an unauthenticated,…
CVE-2025-27507 — Critical (CVSS 9.0): The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration.…
CVE-2025-53895 — High (CVSS 8.8): ZITADEL is an open source identity management system. Starting in version 2.53.0 and prior to versions 4.0.0-rc.2,…

All CVEs affecting Zitadel →

Other CWE-307 (Improper Restriction of Excessive Authentication Attempts) vulnerabilities

CVE-2026-6853 — Critical (CVSS 9.8): Improper restriction of excessive authentication attempts vulnerability in Başbelen Group Food Cafe Businesses…
CVE-2026-8760 — Critical (CVSS 9.8): The Login with OTP plugin for WordPress is vulnerable to authentication bypass in all versions up to, and including,…
CVE-2020-37228 — Critical (CVSS 9.8): iDS6 DSSPro Digital Signage System 6.2 contains a CAPTCHA security bypass vulnerability that allows attackers to bypass…
CVE-2026-33879 — Critical (CVSS 9.8): Federated Learning and Interoperability Platform (FLIP) is an open-source platform for federated training and…
CVE-2026-33640 — Critical (CVSS 9.8): Outline is a service that allows for collaborative documentation. Outline implements an Email OTP login flow for users…
CVE-2026-31851 — Critical (CVSS 9.8): Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout…

Browse all CWE-307 (Improper Restriction of Excessive Authentication Attempts) vulnerabilities →