How severe is CVE-2025-54320?

CVE-2025-54320 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-54320 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54320?

CVE-2025-54320 affects Ascertia Signinghub. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54320?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-54320 have an EU (EUVD) identifier?

Yes. CVE-2025-54320 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198072.

When was CVE-2025-54320 published?

CVE-2025-54320 was published on 2025-11-18 and last updated on 2026-06-17.

CVE-2025-54320

CVE-2025-54320 is a medium-severity vulnerability in Ascertia Signinghub with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198072
Weakness: CWE-770
Affected product: Ascertia Signinghub
Published: 2025-11-18
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-54320?: CVE-2025-54320 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-54320 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54320?: CVE-2025-54320 affects Ascertia Signinghub. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54320?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-54320 have an EU (EUVD) identifier?: Yes. CVE-2025-54320 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198072.
When was CVE-2025-54320 published?: CVE-2025-54320 was published on 2025-11-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ascertia:signinghub:*:*:*:*:*:*:*:*

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