Security readout for executives and security teams
Plain-English summary
CVE-2021-38477 is a critical Versiondog flaw where unauthenticated network access could allow file data to be read, written, manipulated, or deleted. For an operational technology environment, this can threaten confidentiality, integrity, and availability of engineering or automation-management data.
Executive priority
Treat this as urgent for any environment running Versiondog, especially OT or engineering networks. Prioritize exposure reduction first, then confirm vendor remediation guidance and backup integrity.
Technical view
The CVE describes multiple API function codes in AUVESY Versiondog that permit file and directory read/write operations. The assigned CVSS 3.1 score is 9.8 with network access, low complexity, no privileges, and no user interaction required. The listed weakness is CWE-73.
Likely exposure
The provided source bundle lists AUVESY Versiondog as affected across all versions, but does not provide deployment-specific exposure data. Risk is highest where Versiondog API services are reachable from untrusted networks.
Exploitation context
The bundle does not show CISA KEV listing or other cited evidence of active exploitation. The CVSS vector indicates the issue is remotely reachable and unauthenticated, but exploit activity should not be assumed from the provided evidence.
Researcher notes
Evidence is limited to the CVE record and CISA advisory reference in the bundle. Do not infer patch availability, exploit maturity, or product variants beyond AUVESY Versiondog as listed.
Mitigation direction
- Check AUVESY and CISA guidance for supported fixes or compensating controls.
- Restrict Versiondog API access to trusted management networks only.
- Block direct internet exposure for Versiondog services.
- Use network segmentation and VPN controls around OT management systems.
- Maintain tested backups of Versiondog files and configuration data.
Validation and detection
- Inventory all Versiondog deployments and confirm version ownership.
- Identify whether Versiondog API services are reachable from untrusted networks.
- Review CISA advisory and vendor guidance for affected scope.
- Check logs and backups for unexpected file changes or deletions.
- Confirm firewall rules restrict access to approved administrators.
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-73: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupCVE-2021-38477 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/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.
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:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/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://us-cert.cisa.gov/ics/advisories/icsa-21-292-01CVE reference · x_refsource_CONFIRM
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.
External Control of File Name or Path
External Control of File Name or Path represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.