How severe is CVE-2025-42599?

CVE-2025-42599 has a CVSS 3.0 base score of 9.8 (CRITICAL). EPSS estimates a 3.3% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2025-42599: Qualitia Active! Mail Stack-Based Buffer Overflow

CISA Known Exploited Vulnerabilities

Qualitia Active! Mail Stack-Based Buffer Overflow Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2025-04-28

Remediation due

2025-05-19

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 notes
https://www.qualitia.com/jp/news/2025/04/18_1030.html ; https://nvd.nist.gov/vuln/detail/CVE-2025-42599

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.

Severity

CVSS 3.0 · CNA9.8 CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
QUALITIA CO., LTD.	Active! mail 6	BuildInfo: 6.60.05008561 and earlier

References

2 Links

Other references

Record Details

Published

2025-04-18

Last updated

2026-02-26

Assigner (CNA)

jpcert

Credited to

Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

CWE-121 · Stack-based Buffer Overflow

Fuzzing Binary Exploitation

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.