Security readout for executives and security teams
Plain-English summary
This vulnerability can let a low-privileged local user read sensitive information through the IObit Advanced SystemCare Ultimate driver. It is not a remote break-in by itself, but it can expose kernel or device data on endpoints where the affected version is installed.
Executive priority
Treat this as a targeted endpoint remediation item. It is medium severity, not internet-facing, but it can weaken confidentiality controls on affected workstations and should be removed or updated during normal vulnerability cycles.
Technical view
CVE-2021-21792 affects IObit Advanced SystemCare Ultimate 14.2.0.220. The driver mishandles privileged I/O read requests, allowing specially crafted IRPs to perform privileged reads. The reported impact is kernel-context information disclosure through four-byte I/O device reads, mapped to CWE-782.
Likely exposure
Exposure is limited to systems running IObit Advanced SystemCare Ultimate 14.2.0.220 with the affected driver installed. The CVSS vector requires local access and low privileges, so endpoint inventory matters more than perimeter exposure.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked as CISA KEV. The vulnerability requires local access and a low-privileged account, making it most relevant after initial endpoint access or insider misuse.
Researcher notes
The evidence identifies information disclosure from privileged I/O reads in a driver, not privilege escalation or code execution. No source-provided patch version is included in the bundle, so remediation should be tied to vendor or Talos guidance.
Mitigation direction
- Inventory endpoints for IObit Advanced SystemCare Ultimate 14.2.0.220.
- Remove the affected product where it is not operationally required.
- Check vendor and Talos guidance for fixed-version remediation before upgrade decisions.
- Restrict local user privileges on affected endpoints until remediation is complete.
- Monitor for unusual local interaction with the IObit driver.
Validation and detection
- Confirm whether version 14.2.0.220 is installed on managed endpoints.
- Verify whether the affected driver is present after remediation.
- Confirm unprivileged users cannot access the vulnerable driver interface.
- Review endpoint telemetry for suspicious local driver access attempts.
- Re-run inventory to confirm vulnerable installations are gone.
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-2021-21792 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.