Security readout for executives and security teams
Plain-English summary
This vulnerability can let a highly privileged remote user crash the web management service on affected ASUS BMC firmware. It is primarily an availability risk to server management access, not a confirmed data theft or takeover issue in the supplied sources.
Executive priority
Treat this as a moderate-priority infrastructure hygiene issue. It can disrupt remote server management if a privileged account is abused, but the supplied evidence does not support emergency handling for active exploitation or unauthenticated compromise.
Technical view
CVE-2021-28201 is a CWE-120 buffer overflow in the Service configuration-1 function of ASUS BMC firmware web management. The function does not validate user-supplied string length. CVSS v3.1 is 4.9, with network access, low complexity, high privileges required, and high availability impact.
Likely exposure
Exposure is most likely in organizations running the listed ASUS ASMB9-iKVM, RS, ESC, E700, WS, Z11, or KNPA systems at the affected BMC firmware versions. Risk rises if the BMC web interface is reachable beyond a controlled management network.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation. The CVSS vector requires high privileges and no user interaction. The described impact is abnormal termination of the BMC web service, not confirmed code execution.
Researcher notes
Affected versions are named, but CPEs and explicit fixed versions are not supplied. Do not assume remote code execution: the public description and CVSS emphasize privileged access and availability impact. Validate exposure through asset inventory, firmware comparison, and management-plane reachability.
Mitigation direction
- Check ASUS and TWCERT guidance for corrected firmware or vendor-recommended handling.
- Update affected ASUS BMC firmware when an applicable vendor fix is available.
- Restrict BMC web management to dedicated management networks or VPN access.
- Limit privileged BMC accounts and review who can change service configuration.
- Monitor BMC web service availability and unexpected restarts.
Validation and detection
- Inventory ASUS servers and BMC modules in scope.
- Compare installed BMC firmware versions against the affected version list.
- Confirm BMC web interfaces are not exposed to the public internet.
- Review BMC logs for abnormal web service termination.
- Verify remediation status against ASUS or TWCERT advisory 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
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CWE-120: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-28201 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-132-4571-d454c-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.