Buffer overflow in Qualitia Co., Ltd. Active! Mail 6

CVE-2025-42599

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/…

Vulnerability class: Buffer Overflow

EPSS: 0.079 (92.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-42599?
CVE-2025-42599 is a critical-severity vulnerability in Qualitia Co., Ltd. Active! Mail 6, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-04-18.
How severe is CVE-2025-42599?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-42599 known to be exploited?
Yes. CVE-2025-42599 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-04-28), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.