---
id: "CVE-2025-42599"
kind: "vulnerability"
aliases: ["CVE-2025-42599"]
title: "qualitia active\\! mail: Active! mail 6 BuildInfo: 6.60.05008561 and earlier contains a stack-based buffer overflow vulnerability"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "other"
products: [{"name": "Qualitia Active! Mail", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "qualitia active\\! mail", "fixed": ["6.60.05008562"], "affected": "< 6.60.05008562", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "mail-server", "other", "qualitia-active-mail", "self-hosted"]
not_affected_if: ["not-running-qualitia-active-mail"]
published_at: "2025-04-18T04:15:30+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-42599", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-42599", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# qualitia active\! mail: Active! mail 6 BuildInfo: 6.60.05008561 and earlier contains a stack-based buffer overflow vulnerability

Qualitia Active! Mail, a Japanese enterprise mail product, has a stack-based buffer overflow that a remote attacker can trigger with a crafted request. The overflow can allow arbitrary code execution or a denial of service, and CISA lists it as actively exploited.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Qualitia Active! Mail affected ? fixed ?
- vendor:qualitia active\! mail affected < 6.60.05008562 fixed 6.60.05008562

## Fix

Apply the vendor's mitigation per CISA guidance; discontinue use if no mitigation is available. Exact fixed version: unknown

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-42599
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-42599

## From the sources

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.

CISA 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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_