Critical 9.8Known exploited (CISA KEV)Published Apr 18, 2025

CVE-2025-42599Active! mail 6 BuildInfo: 6.60.05008561 and earlier contains a stack-based buffer overflow vulnerability.

Updated under an hour ago (2026-10-19 09:00 UTC)

Does this affect you?

It affects QUALITIA CO., LTD. Active! mail 6 and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Apr 28, 2025; federal agencies had to remediate by May 19, 2025. Treat that date as your deadline.

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Every CVE for QUALITIA CO., LTD. Active! mail 6

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.0, CNA)CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-121
Known exploited: Added to CISA KEV Apr 28, 2025; federal remediation due May 19, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 3.30% (percentile 88)
Assigned by: jpcert
NVD analysis: Analyzed
Record last updated: Feb 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

QUALITIA CO., LTD. Active! mail 6 qualitia:active_mail_6 (from the name)	BuildInfo: 6.60.05008561 and earlier	CNA record
qualitia active!_mail qualitia:active!_mail	before 6.60.05008562	NVD

References

https://www.qualitia.com/jp/news/2025/04/18_1030.htmlvendor-advisory
https://jvn.jp/en/jp/JVN22348866/third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-42599us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.