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

criticalknown exploitedCVE-2025-42599
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Qualitiaproduct: Active! MailRemote code executionDenial of service
What
The vulnerability allows a remote, unauthenticated attacker to execute arbitrary code or trigger a denial-of-service.
Who is affected
Deployments of Qualitia Active! Mail are affected.
Urgency
Immediate action is required due to active exploitation and critical severity.
Action
Patch to the latest version of Qualitia Active! Mail.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-04-28
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-42599

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-42599coverage & exploitation statusNVD · CVE.org

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