Security readout for executives and security teams
Plain-English summary
This flaw affects several ASUS BMC firmware versions used for server out-of-band management. An attacker who already has administrator access to the BMC web interface could use a path traversal weakness in a video recording function to read system files. The main business risk is sensitive information exposure from a management controller.
Executive priority
Treat this as a moderate infrastructure hygiene issue, not an emergency based on the supplied evidence. Prioritize systems where BMC access is broadly reachable, internet-exposed, or shared across many administrators.
Technical view
CVE-2021-28206 is a CWE-22 path traversal issue in ASUS BMC firmware’s web management Record video file function. The source says a specific parameter is not filtered. Network exploitation is possible, but requires high privileges, no user interaction, and impacts confidentiality only under the supplied CVSS vector.
Likely exposure
Exposure is most likely where affected ASUS BMC firmware is deployed and the BMC web interface is reachable to administrators or broader networks. Public internet exposure would increase risk, but the source bundle does not state exposure prevalence.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Because administrator permission is required, this is more relevant after credential compromise, insider misuse, or weak BMC access controls than as an unauthenticated perimeter entry point.
Researcher notes
The affected list is specific, but the bundle provides no CPEs, fixed versions, exploit proof, or detailed advisory text. Avoid assuming broader ASUS products are affected. Validation should stay focused on firmware version, BMC access exposure, and vendor remediation status.
Mitigation direction
- Inventory ASUS BMC firmware versions listed for CVE-2021-28206.
- Check ASUS and TWCERT guidance for fixed firmware or approved remediation.
- Restrict BMC web access to a dedicated management network or VPN.
- Review and reduce BMC administrator accounts to required personnel only.
- Monitor BMC logs for unusual authenticated access to video recording features.
Validation and detection
- Compare installed BMC firmware versions against the affected product and version list.
- Confirm BMC web interfaces are not reachable from untrusted networks.
- Review administrator account inventory and recent authentication history.
- Check whether vendor firmware updates or advisories apply to each affected device.
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-22: 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-28206 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
- Medium
- CVSS
- 4.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A: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:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N1.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.9MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.asus.com/content/ASUS-Product-Security-Advisory/CVE reference · x_refsource_MISC
- https://www.asus.com/tw/support/callus/CVE reference · x_refsource_MISC
- https://www.twcert.org.tw/tw/cp-132-4576-422ac-1.htmlCVE 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.
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.