Security readout for executives and security teams
Plain-English summary
CVE-2021-31737 describes remote code execution in emlog v5.3.1 and v6.0.0 tied to database backup file upload handling in admin/data.php. If an exposed or misused admin interface is affected, compromise could extend beyond the blog application to the hosting environment.
Executive priority
Prioritize systems running affected emlog versions, especially internet-facing sites or hosted environments with business-critical data. Because the issue is described as RCE, remediation planning should be prompt even though public severity scoring and exploitation evidence are limited.
Technical view
The public CVE text identifies RCE caused by upload of a database backup file through admin/data.php in emlog 5.3.1 and 6.0.0. The bundle does not provide CVSS, CWE, authentication requirements, fixed versions, or detailed affected CPEs.
Likely exposure
Exposure is most likely where emlog 5.3.1 or 6.0.0 is deployed and its administrative functions are reachable. The sources do not confirm whether exploitation requires administrator authentication, so treat exposed admin panels as the primary concern.
Exploitation context
CISA KEV is false in the source bundle, and no cited source states active exploitation. The GitHub issue reference indicates public vulnerability discussion, but the provided evidence is incomplete on exploit maturity and prerequisites.
Researcher notes
The record is sparse: no CVSS vector, CWE, CPE, patch version, or authentication detail is provided. Avoid assuming unauthenticated reachability. Focus validation on version confirmation, admin exposure, upload behavior, and vendor/project follow-up.
Mitigation direction
- Identify any emlog 5.3.1 or 6.0.0 installations.
- Check emlog vendor guidance for a fixed release or supported migration path.
- Restrict administrative interface access to trusted networks and administrators.
- Review database backup upload functionality and disable it if vendor guidance recommends.
- Monitor admin activity and server-side file changes for suspicious behavior.
Validation and detection
- Confirm deployed emlog version from application records or package metadata.
- Verify whether admin/data.php exists in the deployed application.
- Confirm the admin interface is not publicly reachable unnecessarily.
- Review logs for unusual database backup upload activity.
- Check vendor or project issue updates for patch information.
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-2021-31737 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/emlog/emlog/issues/82CVE reference · x_refsource_MISC
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.