CVE-2025-42599 Qualitia Active! Mail: memory-safety flaw
In plain words: The program mishandles the memory it uses to keep track of data. A specially made input can scramble that memory. Usually lets an attacker crash the program or run their own code with its permissions.
Confirmed exploited by CISA on · US federal patch deadline May 19, 2025
What to do
- Install Qualitia's security update for Active! Mail. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Qualitia Active! Mail Stack-Based Buffer Overflow Vulnerability
- Product
- Qualitia Active! Mail
- CISA description
- 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.
- Type of flaw
- Memory-safety flaw (CWE-121)
- Confirmed exploited
- Apr 28, 2025
- US federal patch deadline
- May 19, 2025
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Answering about CVE-2025-42599 ·
Questions about CVE-2025-42599
Is CVE-2025-42599 being exploited?
Yes. CISA added CVE-2025-42599 to its Known Exploited Vulnerabilities catalog on Apr 28, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2025-42599?
Install Qualitia's security update for Active! Mail. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2025-42599?
Only if you use Qualitia Active! Mail. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.