CVE-2025-42599
CriticalExploitedPublic exploitActive!
Published Apr 18, 2025 · Updated Sep 24, 2026
Key Facts
Patch immediately- CVE-2025-42599 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Active\! Mail (Qualitia), Active! mail 6.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 18, 2025. Public exploit code is available.
- EPSS estimates a 3.3% probability of exploitation in the next 30 days.
- Fixed versions are available, including Active\! Mail 6.60.05008562.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
3.3%
Higher than 88.3% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-42599 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Apr 28, 2025 | May 19, 2025 | Not reported |
| Industry KEV feed | Apr 18, 2025 | May 19, 2025 | Not reported |
| CIRCL KEV | Apr 28, 2025 | May 19, 2025 | Not reported |
| ENISA EUVD | Apr 28, 2025 | n/a | Not reported |
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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Active\! MailQualitia | See advisory | 6.60.05008562 |
| Active! mail 6 | >= BuildInfo: 6.60.05008561 and earlier | n/a |
Patched Releases
Active\! Mail
6.60.05008562
Timeline
Publicly disclosed
Apr 18, 2025
Added to Industry KEV feed
Apr 18, 2025
Added to CISA KEV
Apr 28, 2025
Added to CIRCL KEV
Apr 28, 2025
Added to ENISA EUVD
Apr 28, 2025
Last updated
Sep 24, 2026
Weakness Type
- CWE-121 Stack-based Buffer Overflow
References
- advisoryhttps://jvn.jp/en/jp/JVN22348866/
- advisoryhttps://www.qualitia.com/jp/news/2025/04/18_1030.html
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Active!
Affected: Active\! Mail (Qualitia); Active! mail 6 versions >= BuildInfo: 6.60.05008561 and earlier. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 18, 2025.
Yes. It was added on Apr 28, 2025 with a federal remediation due date of May 19, 2025.
Public exploit code is available.
Fixed versions are available, including Active\! Mail 6.60.05008562.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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