Is CVE-2025-52691 in the CISA KEV catalog?

Yes. CVE-2025-52691 is on the CISA Known Exploited Vulnerabilities list, added 2026-01-26, and has known ransomware campaign use.

What is the CVSS severity of CVE-2025-52691?

CVE-2025-52691 has a CVSS v3 base score of 10.0 (CRITICAL).

What is the EPSS score for CVE-2025-52691?

CVE-2025-52691 has an EPSS score of 85.46% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-52691?

Upgrade smartermail to 100.0.9413 or later.

CVE & CISA-KEV Catalog

CVE-2025-52691

CRITICALCISA KEVEPSS 100th pctl

10.0

CVSS v3

NVD

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.

CWE-434Unrestricted File Upload

How to fix

Remediation Available

smartermailNVD

Affected:< 100.0.9413Fixed in:100.0.9413CVE-2025-52691derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

85.46%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-02-16

Associated with ransomware campaigns

References

Exploit1

github.com

Third-Party Advisory1

csa.gov.sg

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-434 (Unrestricted File Upload) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12617	High	8.1	100%	KEV	Fix
CVE-2018-15961	Critical	9.8	100%	KEV	-
CVE-2021-31207	Medium	6.6	100%	KEV + Ransom	Fix
CVE-2017-12615	High	8.1	100%	KEV + Ransom	-
CVE-2025-31324	Critical	10.0	99%	KEV + Ransom	-
CVE-2024-50623	Critical	9.8	99%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-01-27.