Exploited vulnerability · CISA KEV
Yes. CVE-2025-42599, Qualitia Active! Mail Stack-Based Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 28 Apr 2025, 10 days after it was published. It affects Qualitia Active! Mail. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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.
| Vendor | Qualitia (1 exploited CVE in KEV) |
| Product | Active! Mail |
| Vulnerability | Qualitia Active! Mail Stack-Based Buffer Overflow Vulnerability |
| Weakness | CWE-121 |
| Published | 18 Apr 2025 |
| Added to KEV | 28 Apr 2025 |
| Reported by (CNA) | jpcert |
Yes. CISA added CVE-2025-42599 to the Known Exploited Vulnerabilities catalog on 28 Apr 2025, which means there is reliable evidence of exploitation in the wild.
CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Qualitia's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Active! Mail and watch it for signs of compromise.
Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2025 · act-now radar.
We check exposure across your estate, patch or mitigate with your team, and set up detection for what attackers do after exploiting it.
Get in touch →