Security readout for executives and security teams
Plain-English summary
CVE-2019-0909 is a Microsoft Windows Jet Database Engine memory-handling flaw. A victim must be tricked into opening a specially crafted file, after which an attacker could run code on that system. The business risk is highest where affected Windows endpoints or servers remain unpatched and handle untrusted files.
Executive priority
Treat as high priority for patch verification across legacy Windows estates. It is not described as actively exploited in the provided sources, but successful exploitation could give attacker-run code on a victim system after file interaction.
Technical view
The vulnerability is remote code execution in Windows Jet Database Engine object handling in memory. Microsoft states exploitation requires user interaction through opening a crafted file. The provided CVSS 3.1 score is 7.5 with high confidentiality, integrity, and availability impact, high attack complexity, no privileges required, and remediation available.
Likely exposure
Exposure is likely on listed Microsoft Windows client and server versions that have not received the Microsoft update for CVE-2019-0909, especially systems where users open externally supplied files.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates proof-of-concept exploit maturity, but exploitation still requires persuading a user to open a crafted file.
Researcher notes
Key constraints are user interaction and high attack complexity. The bundle does not identify specific file types, exploit chains, affected Jet components beyond Windows Jet Database Engine, or detailed patch identifiers, so validation should anchor to Microsoft advisory status and asset inventory.
Mitigation direction
- Apply the Microsoft security update for CVE-2019-0909 to affected Windows systems.
- Prioritize endpoints and servers that process untrusted or externally supplied files.
- Use Microsoft guidance for any systems where the update cannot be installed.
- Filter or quarantine suspicious file attachments from untrusted sources.
- Limit exposure of legacy affected Windows systems until remediation is confirmed.
Validation and detection
- Inventory Windows versions against the affected products listed in the source bundle.
- Confirm the applicable Microsoft CVE-2019-0909 update is installed.
- Check vulnerability management tools for remaining CVE-2019-0909 findings.
- Review mail and endpoint telemetry for unusual crafted-file delivery attempts.
- Document exceptions where systems cannot be patched and track compensating controls.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
Execution 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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-0909 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
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.
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:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C1.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Jet Database Engine Remote Code Execution VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0909CVE reference · x_refsource_MISC, x_transferred
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.