Security readout for executives and security teams
Plain-English summary
This flaw can let a privileged remote user crash the web service on affected ASUS BMC firmware. The main business risk is loss of availability for server management functions, not confirmed data theft or system takeover based on the provided sources.
Executive priority
Treat this as a moderate operational risk. Prioritize assets where BMC access is exposed beyond tightly controlled administrators, because impact is management service disruption and the attack requires privileged access.
Technical view
CVE-2021-28202 is a CWE-120 buffer overflow in the Service configuration-2 function of the ASUS BMC firmware web management page. The vulnerable function does not verify user-supplied string length. CVSS 3.1 is 4.9, network reachable, low complexity, high privileges required, and high availability impact.
Likely exposure
Exposure is limited to organizations running the listed ASUS BMC firmware versions for ASMB9-iKVM and affected ASUS RS, ESC, E700, WS, Z11PA, and KNPA platforms. The source indicates remote access is possible, but exploitation requires privileged permissions.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation. The vulnerability is described as remotely triggerable after obtaining privileged permission and may abnormally terminate the web service. No public exploit status is established by the supplied evidence.
Researcher notes
Evidence supports a length-validation flaw causing buffer overflow and denial of service in specific ASUS BMC firmware versions. The sources do not provide patch version details, exploit availability, or proof of active exploitation, so remediation should be aligned with ASUS and TWCERT guidance.
Mitigation direction
- Identify affected ASUS BMC firmware versions listed in the CVE bundle.
- Check ASUS and TWCERT guidance for vendor-approved firmware updates or mitigations.
- Restrict BMC web management access to trusted administrative networks.
- Review privileged BMC accounts and remove unnecessary access.
- Monitor BMC web service crashes or unexplained management interface outages.
Validation and detection
- Inventory ASUS BMC firmware versions against the affected version list.
- Confirm whether the Service configuration-2 web management function is reachable.
- Verify BMC management interfaces are not broadly exposed.
- Check logs for abnormal web service termination events.
- Document vendor advisory status and remediation decisions for each affected platform.
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-2021-28202 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.
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.