Security Digest · Vulnerability record · Known exploited
CVE-2025-42599: Qualitia Active! Mail Stack-Based Buffer Overflow Vulnerability
Exploited in the wild (CISA KEV). Active!
CISA KEV · added 2025-04-28 CVSS 9.8 Critical EPSS 3.4% · p89
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Qualitia Active! Mail. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-04-28, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-05-19; treat that as the outer limit, not the target.
- EPSS 3.4%, percentile 89: FIRST’s model estimates a 3.4% chance of exploitation activity in the next 30 days, higher than 89% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
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.
CISA’s summary
Qualitia Active! Mail contains a stack-based buffer overflow vulnerability that allows a remote, unauthenticated attacker to execute arbitrary or trigger a denial-of-service via a specially crafted request.
Weakness type: CWE-121.
Product: Qualitia Active! Mail · Assigned by: jpcert · Published: 2025-04-18
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| QUALITIA CO., LTD. | Active! mail 6 | BuildInfo: 6.60.05008561 and earlier |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| jpcert | 3.0 | 9.8 Critical | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2025-04-28; federal due date 2025-05-19. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 3.36% probability of exploitation activity in the next 30 days; percentile 89.
Timeline
- — CVE record published by jpcert
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (qualitia.com) qualitia.com
Vulnerability records
- CVE.org record CVE-2025-42599 cve.org
- NVD entry CVE-2025-42599 nvd.nist.gov
Government
Other references from the CVE record and advisory
- jvn.jp jvn.jp
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