How severe is CVE-2025-54321?

CVE-2025-54321 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-54321 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54321?

CVE-2025-54321 affects Ascertia Signinghub. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54321?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-54321 have an EU (EUVD) identifier?

Yes. CVE-2025-54321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198073.

When was CVE-2025-54321 published?

CVE-2025-54321 was published on 2025-11-18 and last updated on 2026-06-17.

CVE-2025-54321

CVE-2025-54321 is a critical-severity vulnerability in Ascertia Signinghub with a CVSS 3.x base score of 9.8. 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-799.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198073
Weakness: CWE-799
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 reset password function, leading to an email bombing vulnerability. An authenticated attacker can exploit this by automating reset password requests.

Frequently asked questions

What is 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.
How severe is CVE-2025-54321?: CVE-2025-54321 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-54321 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54321?: CVE-2025-54321 affects Ascertia Signinghub. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54321?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-54321 have an EU (EUVD) identifier?: Yes. CVE-2025-54321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198073.
When was CVE-2025-54321 published?: CVE-2025-54321 was published on 2025-11-18 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Ascertia Signinghub

CVE-2025-56221 — Critical (CVSS 9.8): A lack of rate limiting in the login mechanism of SigningHub v8.6.8 allows attackers to bypass authentication via a…
CVE-2025-56218 — Critical (CVSS 9.8): An arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers to execute arbitrary code via uploading a…
CVE-2025-56224 — High (CVSS 8.1): A lack of rate limiting in the One-Time Password (OTP) verification endpoint of SigningHub v8.6.8 allows attackers to…
CVE-2025-56223 — High (CVSS 7.5): A lack of rate limiting in the component /Home/UploadStreamDocument of SigningHub v8.6.8 allows attackers to cause a…
CVE-2025-56219 — High (CVSS 7.1): Incorrect access control in SigningHub v8.6.8 allows attackers to arbitrarily add user accounts without any rate…
CVE-2025-61166 — Medium (CVSS 6.1): An open redirect in Ascertia SigningHub User v10.0 allows attackers to redirect users to a malicious site via a crafted…

All CVEs affecting Ascertia Signinghub →

Other CWE-799 vulnerabilities

CVE-2025-29998 — High (CVSS 8.2): This vulnerability exists in the CAP back office application due to missing rate limiting on OTP requests in an API…
CVE-2026-7402 — High (CVSS 8.1): Improper Control of Interaction Frequency vulnerability in MeWare Software Development Inc. PDKS allows Flooding. This…
CVE-2026-24017 — High (CVSS 8.1): An Improper Control of Interaction Frequency vulnerability [CWE-799] vulnerability in Fortinet FortiWeb 8.0.0 through…
CVE-2021-41177 — High (CVSS 8.1): Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0,…
CVE-2026-30972 — High (CVSS 7.5): Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior o…
CVE-2025-57816 — High (CVSS 7.5): Fides is an open-source privacy engineering platform. Prior to version 2.69.1, the Fides Webserver API's built-in…

Browse all CWE-799 vulnerabilities →