Known exploited vulnerability
CVE-2025-42599
The short answer
CVE-2025-42599 affects QUALITIA CO., LTD. Active! mail 6 and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-04-28: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-121.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Apr 28, 2025
Federal due date May 19, 2025
EPSS, next 30 days
3.4%
Higher than 89% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Active! mail 6. NVD's record lists the exact affected versions.
References
- jvn.jp/en/jp/JVN22348866/ Third Party Advisory
- www.qualitia.com/jp/news/2025/04/18_1030.html Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-42599 US Government Resource
Questions
Is CVE-2025-42599 being exploited?
Yes. CISA added CVE-2025-42599 to its Known Exploited Vulnerabilities catalog on 2025-04-28, with a federal remediation due date of 2025-05-19.
How do I fix CVE-2025-42599?
CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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