Security readout for executives and security teams
Plain-English summary
A flaw in certain ASUS BMC firmware web management pages can let a privileged remote user crash the BMC web service. The main business risk is loss of management availability, not data theft or system takeover based on the provided sources.
Executive priority
Treat as a targeted availability risk for server management infrastructure. Prioritize if affected BMC interfaces are broadly reachable or support critical servers, but evidence does not indicate active exploitation or confidentiality impact.
Technical view
CVE-2021-28188 is a CWE-120 buffer overflow in the Modify user’s information function of ASUS BMC firmware. The function does not verify user-supplied string length. CVSS 3.1 is 4.9 with network access, low complexity, high privileges required, no user interaction, and high availability impact only.
Likely exposure
Exposure appears limited to ASUS BMC firmware for Z10PR-D16 1.14.51, ASMB8-iKVM 1.14.51, and Z10PE-D16 WS 1.14.2. Risk is highest where BMC web management is reachable by many privileged administrators or exposed beyond a restricted management network.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires privileged access to the BMC web management interface. The documented outcome is abnormal termination of the web service, indicating denial of management availability.
Researcher notes
Sources identify affected products and versions but do not provide exploit details or a specific patched version in the supplied bundle. Validation should focus on firmware matching, BMC management-plane exposure, privileged account control, and service stability evidence.
Mitigation direction
- Identify systems running the listed ASUS BMC firmware versions.
- Check ASUS and TWCERT guidance for fixed firmware or vendor-directed mitigations.
- Restrict BMC web management to trusted management networks only.
- Limit and review privileged BMC administrator accounts.
- Monitor BMC web service crashes, restarts, and unexpected management outages.
Validation and detection
- Inventory ASUS BMC/iKVM devices and confirm model plus firmware version.
- Verify whether BMC web interfaces are reachable from untrusted networks.
- Review privileged BMC user lists for unnecessary or shared accounts.
- Check logs or monitoring for web service termination events.
- Confirm remediation status against ASUS or TWCERT published guidance.
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
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ATT&CK lookup starting points
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CWE-120: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-28188 mapping review
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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:N/I:N/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:H/UI:N/S:U/C:N/I:N/A:H1.23.6Primary 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:N/I:N/A:H
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-132-4558-ad16e-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.