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CVE-2025-52691

critical

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.

References

https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/

https://securityaffairs.com/187375/security/u-s-cisa-adds-microsoft-office-gnu-inetutils-smartertools-smartermail-and-linux-kernel-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/01/26/cisa-adds-five-known-exploited-vulnerabilities-catalog

https://www.securityweek.com/fresh-smartermail-flaw-exploited-for-admin-access/

https://www.huntress.com/blog/smartermail-account-takeover-leading-to-rce

https://www.bleepingcomputer.com/news/security/over-6-000-smartermail-servers-exposed-to-automated-hijacking-attacks/

https://www.bleepingcomputer.com/news/security/smartermail-auth-bypass-flaw-now-exploited-to-hijack-admin-accounts/

https://thehackernews.com/2026/01/smartermail-auth-bypass-exploited-in.html

https://labs.watchtowr.com/attackers-with-decompilers-strike-again-smartertools-smartermail-wt-2026-0001-auth-bypass/

https://labs.watchtowr.com/do-smart-people-ever-say-theyre-smart-smartertools-smartermail-pre-auth-rce-cve-2025-52691/

https://securityaffairs.com/186353/security/singapore-csa-warns-of-maximun-severity-smartermail-rce-flaw.html

https://thehackernews.com/2025/12/csa-issues-alert-on-critical.html

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-52691

Details

Source: Mitre, NVD

Published: 2025-12-29

Updated: 2026-01-27

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 10

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

Severity: Critical

EPSS

EPSS: 0.7781

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability Being Monitored