What is CVE-2025-54320?

CVE-2025-54320 is a medium-severity vulnerability in Ascertia Signinghub, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2025-11-18.

How severe is CVE-2025-54320?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Is CVE-2025-54320 known to be exploited?

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

Resource exhaustion in Ascertia Signinghub

CVE-2025-54320

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

EPSS: 0.003 (20.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Affected products

Ascertia Signinghub
N/a — versions n/a

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

Public proof-of-concept exploits

saykino/CVE-2025-54320

References

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

Frequently asked questions

What is CVE-2025-54320?: CVE-2025-54320 is a medium-severity vulnerability in Ascertia Signinghub, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2025-11-18.
How severe is CVE-2025-54320?: Medium severity. CVSS v3 base score is 4.3 out of 10.
Is CVE-2025-54320 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.