How severe is CVE-2025-52691?

CVE-2025-52691 has a CVSS 3.x base score of 10.0, 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-2025-52691 being actively exploited?

Yes. CVE-2025-52691 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-01-26, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2025-52691?

CVE-2025-52691 affects Smartertools Smartermail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-52691?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2025-52691 have an EU (EUVD) identifier?

Yes. CVE-2025-52691 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205544. It is also flagged as exploited in the EUVD (since 2026-01-26).

When was CVE-2025-52691 published?

CVE-2025-52691 was published on 2025-12-29 and last updated on 2026-06-17.

CVE-2025-52691

CVE-2025-52691 is a critical-severity vulnerability in Smartertools Smartermail with a CVSS 3.x base score of 10.0. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-01-26). The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 85% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-01-26)
EU (EUVD) id: EUVD-2025-205544
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-01-26)
Weakness: CWE-434
Affected product: Smartertools Smartermail
Published: 2025-12-29
Last modified: 2026-06-17

Description

Successful exploitation of the vulnerability could allow an unauthenticated attacker to upload arbitrary files to any location on the mail server, potentially enabling remote code execution.

Frequently asked questions

What is CVE-2025-52691?: Successful exploitation of the vulnerability could allow an unauthenticated attacker to upload arbitrary files to any location on the mail server, potentially enabling remote code execution.
How severe is CVE-2025-52691?: CVE-2025-52691 has a CVSS 3.x base score of 10.0, 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-2025-52691 being actively exploited?: Yes. CVE-2025-52691 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-01-26, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2025-52691?: CVE-2025-52691 affects Smartertools Smartermail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-52691?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2025-52691 have an EU (EUVD) identifier?: Yes. CVE-2025-52691 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205544. It is also flagged as exploited in the EUVD (since 2026-01-26).
When was CVE-2025-52691 published?: CVE-2025-52691 was published on 2025-12-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:*

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