Security readout for executives and security teams
Plain-English summary
CVE-2021-28186 affects specific ASUS BMC firmware used for server management. A privileged remote user could trigger a buffer overflow in a web management function and 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 this as a moderate operational resilience issue. It is unlikely to justify emergency response unless affected BMC interfaces are broadly reachable or privileged access is poorly controlled. Prioritize inventory, access restriction, and vendor firmware guidance.
Technical view
The vulnerable ActiveX configuration-2 acquisition function in ASUS BMC firmware does not validate user-supplied string length, creating a CWE-120 buffer overflow. CVSS 3.1 is 4.9: network reachable, low attack complexity, high privileges required, no user interaction, availability impact high, no confidentiality or integrity impact stated.
Likely exposure
Exposure is 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 beyond a tightly controlled management network.
Exploitation context
The bundle does not show CISA KEV listing or evidence of active exploitation. Exploitation requires privileged access to the BMC web management interface, reducing likelihood but making insider, credential compromise, or overexposed management-plane scenarios relevant.
Researcher notes
The record names affected products and versions but does not provide a fixed version, exploit details, or active exploitation evidence. Avoid assuming broader ASUS BMC impact beyond the listed firmware unless vendor guidance confirms it.
Mitigation direction
- Check ASUS and TWCERT guidance for fixed firmware or official mitigations.
- Restrict BMC web access to dedicated management networks and trusted administrators.
- Remove internet exposure for affected BMC management interfaces.
- Review privileged BMC accounts and disable unnecessary access.
- Monitor BMC web service crashes or repeated abnormal terminations.
Validation and detection
- Inventory ASUS BMC models and firmware versions against the affected list.
- Confirm whether BMC web management is reachable from untrusted networks.
- Review BMC privileged accounts for stale, shared, or excessive access.
- Check service logs for unexpected web management crashes.
- Verify remediation status against current ASUS or TWCERT 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
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-120: 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 lookupCVE-2021-28186 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: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-132-4556-ece3d-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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.