#VU107879 Stack-based buffer overflow in Active! mail - CVE-2025-42599

Vulnerability identifier: #VU107879

Vulnerability risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2025-42599

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Active! mail
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: QUALITIA CO., LTD.

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when handling requests. A remote unauthenticated attacker can send a specially crafted request to the server, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Active! mail: before 6.60.06008562

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External links
https://jvn.jp/en/jp/JVN22348866/
https://www.qualitia.com/jp/news/2025/04/18_1030.html
https://www.jpcert.or.jp/at/2025/at250010.html
https://jvndb.jvn.jp/en/contents/2025/JVNDB-2025-000027.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.