How severe is CVE-2025-42599?

CVE-2025-42599 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-42599 being actively exploited?

Yes. CVE-2025-42599 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-04-28, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2025-42599?

CVE-2025-42599 affects Qualitia Active! Mail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-42599?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2025-42599 have an EU (EUVD) identifier?

Yes. CVE-2025-42599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11849. It is also flagged as exploited in the EUVD (since 2025-04-28).

When was CVE-2025-42599 published?

CVE-2025-42599 was published on 2025-04-18 and last updated on 2026-06-17.

CVE-2025-42599

CVE-2025-42599 is a critical-severity vulnerability in Qualitia Active! Mail with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-04-28). The underlying weakness is classified as CWE-121.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-04-28)
EU (EUVD) id: EUVD-2025-11849
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-04-28)
Weakness: CWE-121
Affected product: Qualitia Active! Mail
Published: 2025-04-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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/or a denial-of-service (DoS) condition.
How severe is CVE-2025-42599?: CVE-2025-42599 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-42599 being actively exploited?: Yes. CVE-2025-42599 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-04-28, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2025-42599?: CVE-2025-42599 affects Qualitia Active! Mail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-42599?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2025-42599 have an EU (EUVD) identifier?: Yes. CVE-2025-42599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11849. It is also flagged as exploited in the EUVD (since 2025-04-28).
When was CVE-2025-42599 published?: CVE-2025-42599 was published on 2025-04-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:qualitia:active\!_mail:*:*:*:*:*:*:*:*

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