Security readout for executives and security teams
Plain-English summary
CVE-2021-28192 is a buffer overflow in the remote video storage function of ASUS BMC firmware. A remote attacker must already have high privileges, but could crash the BMC web service, affecting management availability for affected ASUS server and workstation platforms.
Executive priority
Treat this as a moderate infrastructure management risk. It is not reported as actively exploited and requires high privileges, but loss of BMC web management can slow incident response and remote server operations.
Technical view
The ASUS BMC web management page fails to validate user-supplied string length in the remote video storage function. The issue is CWE-120 and is scored CVSS 3.1 4.9, with network access, low attack complexity, high privileges required, no user interaction, and high availability impact only.
Likely exposure
Exposure is limited to systems running the listed ASUS BMC firmware versions, including ASMB9-iKVM and several RS, ESC, E700, WS, Z11PA, and KNPA platforms. Risk is higher where BMC web management is reachable beyond a tightly controlled administration network.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector requires high privileges, so this is more likely a post-authentication availability risk than an initial-access vulnerability.
Researcher notes
No exploit details, patch version, or CPE data were provided in the source bundle. Validate findings by model and firmware version, and rely on ASUS or TWCERT advisories for remediation specifics rather than assuming a universal firmware fix.
Mitigation direction
- Identify affected ASUS BMC firmware versions in server and workstation inventories.
- Check ASUS and TWCERT guidance for fixed firmware or vendor-approved workarounds.
- Restrict BMC web management access to trusted administration networks or VPN paths.
- Limit privileged BMC accounts to administrators with a clear operational need.
- Monitor BMC web service crashes until remediation is confirmed.
Validation and detection
- Compare installed BMC firmware versions against the affected version list.
- Confirm BMC management interfaces are not internet-exposed.
- Review BMC logs for abnormal web service termination events.
- Verify privileged BMC account membership and recent authentication activity.
- Document remediation status per affected model and firmware version.
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-2021-28192 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-132-4562-4b207-1.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.