Security readout for executives and security teams
Plain-English summary
This flaw affects IOBit Advanced SystemCare Ultimate 14.2.0.220. A local low-privileged user could cause the product’s driver to read privileged I/O data and disclose sensitive kernel or device information. It is not remotely exploitable based on the provided sources, but it matters on shared or compromised Windows endpoints.
Executive priority
Treat this as a moderate endpoint hardening issue, not an internet-facing emergency. Address it during vulnerability remediation cycles, with faster action for shared systems or endpoints at higher risk of local compromise.
Technical view
CVE-2021-21790 is a CWE-782 issue in the product driver’s handling of privileged I/O read requests. A crafted IRP can trigger privileged reads in driver context, potentially exposing two bytes of I/O device data through the IN instruction. CVSS is 6.5 with local access, low complexity, low privileges, no user interaction, changed scope, and high confidentiality impact.
Likely exposure
Exposure is likely limited to Windows endpoints running IOBit Advanced SystemCare Ultimate 14.2.0.220 or its vulnerable driver. Risk is higher on multi-user systems, unmanaged endpoints, or hosts where an attacker already has local code execution.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires local access with low privileges and a crafted request to the vulnerable driver. The impact described is information disclosure, not code execution or service disruption.
Researcher notes
The evidence supports a local information disclosure vulnerability in a privileged Windows driver path. The source bundle does not identify a fixed build, public exploit, or active exploitation. Avoid assuming broader IOBit product impact beyond the named version unless vendor evidence confirms it.
Mitigation direction
- Inventory endpoints for IOBit Advanced SystemCare Ultimate 14.2.0.220.
- Remove the affected product or vulnerable driver where it is not required.
- Check IOBit and Talos guidance for fixed versions or vendor remediation.
- Prioritize shared workstations and systems with untrusted local users.
- Reduce local user access on affected hosts until remediation is complete.
Validation and detection
- Confirm whether the affected product version is installed on managed endpoints.
- Check for the vulnerable driver associated with Advanced SystemCare Ultimate 14.2.0.220.
- Verify the product is removed or updated after remediation.
- Document exceptions where the product remains installed.
- Monitor vendor and Talos references for any missing fix details.
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-782: 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-2021-21790 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
- 6.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
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:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N24Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.5MediumVector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1255CVE 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.
Exposed IOCTL with Insufficient Access Control
Exposed IOCTL with Insufficient Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.