What is CVE-2025-54321?

CVE-2025-54321 is a critical-severity vulnerability in Ascertia Signinghub, classified under CWE-799. CVSS score: 9.8/10. Published 2025-11-18.

How severe is CVE-2025-54321?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-54321 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Ascertia Signinghub

CVE-2025-54321

In Ascertia SigningHub through 8.6.8, there is a lack of rate limiting on the reset password function, leading to an email bombing vulnerability. An authenticated attacker can exploit this by automating reset password requests.

EPSS: 0.004 (32.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ascertia Signinghub
N/a — versions n/a

Weakness classification (CWE)

CWE-799

Public proof-of-concept exploits

saykino/CVE-2025-54321

References

cve@mitre.org (Vendor Advisory)
cve@mitre.org (Third Party Advisory)

Frequently asked questions

What is CVE-2025-54321?: CVE-2025-54321 is a critical-severity vulnerability in Ascertia Signinghub, classified under CWE-799. CVSS score: 9.8/10. Published 2025-11-18.
How severe is CVE-2025-54321?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-54321 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.