CVE-2025-56221
CRITICALCVSS 9.8/10EPSS 0.57%
Last modified
CVE-2025-56221 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A lack of rate limiting in the login mechanism of SigningHub v8.6.8 allows attackers to bypass authentication via a brute force attack.. EPSS estimates a 0.57% chance of exploitation in the next 30 days.
Description
A lack of rate limiting in the login mechanism of SigningHub v8.6.8 allows attackers to bypass authentication via a brute force attack.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ascertia | Signinghub | <= 8.6.8 |
References
- https://github.com/saykino/CVE-2025-56221Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-56221?
A lack of rate limiting in the login mechanism of SigningHub v8.6.8 allows attackers to bypass authentication via a brute force attack.
How severe is CVE-2025-56221?
CVE-2025-56221 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.
How do I fix CVE-2025-56221?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2025-56221?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST