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CVE-2025-56221 — Advisory detailing CVE-2025-56221, an authentication rate-limiting flaw in Ascertia SigningHub allowing brute-force attacks, with affected versions and mitigation guidance. | Kitploit
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GitHubsaykino/cve-2025-56221

CVE-2025-56221

Advisory detailing CVE-2025-56221, an authentication rate-limiting flaw in Ascertia SigningHub allowing brute-force attacks, with affected versions and mitigation guidance.

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511 months agoNot yet reviewed

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CVE-2025-56221 Improper Restriction of Excessive Authentication Attempts

Description

An attacker can make unlimited authentication attempts, increasing the risk of compromising targeted user accounts through password guessing.

CVSS Score: 7.5 (High)

Attack Type

  • Remote (Authenticated)

Affected Versions

  • Versions before <= 8.6.8

Vendor of Product

  • Ascertia

Affected Product Code Base

  • SigningHub

Affected Component

  • Authentication API (/authenticate).

Mitigations

  • Implement rate-limit/cooldown period for the authentication API.

Vulnerability Details

  • The authentication API does not enforce rate limiting on login attempts, allowing an attacker to repeatedly try different password combinations without restriction. This can lead to brute-force attacks, where an attacker systematically guesses user credentials to gain unauthorized access to accounts. Without proper rate limiting or account lockout mechanisms, the system becomes highly susceptible to automated attacks, especially when combined with leaked or commonly used passwords.

Fixed versions

  • Versions after > 8.6.8

Discovered By:

  • Yazan Abu-Nadi
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