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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-04-28
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-18 · updated 2026-09-24
• Weakness: CWE-121

Description

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.

Affected products

• QUALITIA CO., LTD. Active! mail 6: before 6.60.05008562 — fixed in 6.60.05008562

How to fix

Upgrade to a fixed version: QUALITIA CO., LTD. Active! mail 6 6.60.05008562. Check the vendor advisory for mitigations.

References

• https://jvn.jp/en/jp/JVN22348866/
• https://www.qualitia.com/jp/news/2025/04/18_1030.html
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-42599

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