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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (23.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.ascertia.com/company/vulnerability-disclosure-policy/ (Vendor Advisory)
- github.com/saykino/CVE-2025-54320 (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.