CVE-2025-42599 — Qualitia Active! Mail Stack-Based Buffer Overflow Vulnerability

Active! mail 6 BuildInfo: 6.60.05008561 and earlier contains a stack-based buffer overflow vulnerability. Receiving a specially crafted request created and sent by a remote unauthenticated attacker may lead to arbitrary code execution and/or a denial-of-service (DoS) condition.

01What is this vulnerability?

Active! mail 6 BuildInfo: 6.60.05008561 and earlier contains a stack-based buffer overflow vulnerability. Receiving a specially crafted request created and sent by a remote unauthenticated attacker may lead to arbitrary code execution and/or a denial-of-service (DoS) condition.

02Affected products

Vendor	Product	Versions
QUALITIA CO., LTD.	Active! mail 6	BuildInfo: 6.60.05008561 and earlier

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2025-04-28. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-04-18T03:52:48.607Z
• Last modified: 2026-02-26T18:28:10.158Z
• Added to CISA KEV: 2025-04-28
• BOD 22-01 due: 2025-05-19

09References

• www.qualitia.com — https://www.qualitia.com/jp/news/2025/04/18_1030.html
• jvn.jp — https://jvn.jp/en/jp/JVN22348866/