Security readout for executives and security teams
Plain-English summary
CVE-2021-47761 lets a low-privileged local user on a system running MilleGPG5 5.7.2 gain SYSTEM-level control by replacing a MariaDB service executable that runs after reboot. This is serious for shared workstations, terminal servers, or environments where non-admin users can log in locally.
Executive priority
Treat as high priority for endpoints or servers where non-admin users can log in. Prioritize validation and permission review before the next maintenance reboot. If MilleGPG5 5.7.2 is not deployed, business exposure is likely low.
Technical view
MilleGPG5 5.7.2 has insecure file permissions in the MariaDB bin directory, categorized as CWE-276. Authenticated local users can modify service executable files, including mysqld.exe. A replaced executable may run with SYSTEM privileges when the computer restarts. CVSS 4.0 score is 8.5, with local attack vector and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to systems running MilleGPG5 5.7.2 where unprivileged authenticated users have local access. Internet-facing exposure is not indicated by the sources. The highest concern is multi-user Windows systems or endpoints where standard users can log in and the vulnerable file permissions remain unchanged.
Exploitation context
The CVE references an ExploitDB entry, so public exploit information exists. The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires local authenticated access and a restart condition for the replaced service executable to run with elevated privileges.
Researcher notes
Evidence is clear on the vulnerable condition and privilege escalation path, but the source bundle does not identify a vendor patch version or advisory. Do not assume remote exploitability. Public exploit reference exists, but active exploitation is not supported by the provided sources.
Mitigation direction
- Check Millegpg vendor guidance for an updated or corrected MilleGPG5 release.
- Restrict write access to the MariaDB bin directory to trusted administrators only.
- Review service executable permissions for unintended modification rights by standard users.
- Limit local login rights on systems running MilleGPG5 5.7.2.
- Monitor critical service binaries for unauthorized replacement or integrity changes.
Validation and detection
- Inventory systems for MilleGPG5 version 5.7.2.
- Inspect MariaDB bin directory permissions for non-admin write access.
- Verify mysqld.exe ownership, timestamp, and integrity against a trusted baseline.
- Review local user access on affected systems.
- Check restart history and service binary change events where available.
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.
CWE-276: 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-47761 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
- 8.5 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.5HighVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-50558CVE reference · exploit
- Vendor HomepageCVE reference · product
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.
Incorrect Default Permissions
Incorrect Default Permissions represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.