What is the CVSS score of CVE-2025-54320?

CVE-2025-54320 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L. EPSS exploitation probability: 0.1%.

Which versions of Signinghub are affected by CVE-2025-54320?

Organizations using Ascertia SigningHub should be aware of moderate risk from CVE-2025-54320 rated CVSS 4.3. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2025-54320?

During next maintenance window: Identify affected systems running Ascertia SigningHub and apply vendor patches when convenient. Monitor vendor channels for patch availability.

Signinghub CVE-2025-54320

MEDIUM

Allocation of Resources Without Limits or Throttling (CWE-770)

2025-11-18 cve@mitre.org

Denial Of Service Signinghub

4.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.3 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:22 vuln.today

CVE Published

Nov 18, 2025 - 19:15 nvd

MEDIUM 4.3

DescriptionCVE.org

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.

AnalysisAI

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. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Allocation of Resources Without Limits (CWE-770), which allows attackers to exhaust system resources through uncontrolled allocation. 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. Affected products include: Ascertia Signinghub. Version information: through 8.6.8.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Set resource limits, implement rate limiting, validate input sizes.