Security readout for executives and security teams
Plain-English summary
CVE-2025-42599 is a critical flaw in QUALITIA Active! mail 6. A remote attacker who is not logged in can send a crafted request that may crash the service or run code on the server. CISA lists it as known exploited, so this should be treated as urgent for any exposed deployment.
Executive priority
Immediate action is warranted for any affected deployment, especially if externally reachable. The combination of unauthenticated remote code execution potential, denial-of-service impact, and CISA KEV listing makes this a business continuity and compromise risk.
Technical view
Active! mail 6 BuildInfo 6.60.05008561 and earlier has a stack-based buffer overflow, CWE-121. The CVSS 3.0 score is 9.8 with network attack vector, low complexity, no privileges, and no user interaction. Reported impacts are arbitrary code execution and denial of service.
Likely exposure
Exposure applies to QUALITIA Active! mail 6 BuildInfo 6.60.05008561 and earlier. Risk is highest where the service can receive requests from untrusted or internet-facing networks. The source bundle does not identify other affected products or versions.
Exploitation context
CISA KEV status indicates known exploitation. The provided sources do not include exploit details, observed campaigns, affected organizations, or attacker tooling. Treat internet-reachable instances as high-priority until vendor guidance is applied.
Researcher notes
Evidence supports a critical stack-based buffer overflow in Active! mail 6 with unauthenticated network reachability and possible RCE or DoS. KEV supports active exploitation, but public source details in the bundle do not describe exploit mechanics, indicators, or patch specifics.
Mitigation direction
- Inventory all Active! mail 6 instances and record BuildInfo versions.
- Review QUALITIA and JVN advisories for fixed builds or official mitigations.
- Apply vendor remediation as soon as it is available and tested.
- Reduce untrusted network reachability until remediation is complete.
- Monitor CISA KEV and vendor updates for changed guidance.
Validation and detection
- Confirm whether any instance runs BuildInfo 6.60.05008561 or earlier.
- Verify whether each instance is reachable from untrusted networks.
- Check change records for applied vendor remediation or compensating controls.
- Review service logs for crashes, abnormal requests, or unexpected process behavior.
- Track remediation status against KEV-driven urgency.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-121: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-42599 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.0)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.qualitia.com/jp/news/2025/04/18_1030.htmlCVE reference
- https://jvn.jp/en/jp/JVN22348866/CVE reference
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-42599CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.