Security readout for executives and security teams
Plain-English summary
This Windows flaw can let an attacker who already has limited local access gain higher privileges, potentially compromising sensitive data and system integrity. It is high risk because CISA lists it as known exploited, although exploitation requires local access and is rated high complexity.
Executive priority
Treat as an urgent patching priority because exploitation is documented by CISA and successful abuse could enable broad system compromise. Prioritize exposed or high-value affected hosts, while recognizing that exploitation requires an attacker to obtain local low-privileged access first.
Technical view
CVE-2022-21882 is a Win32k elevation-of-privilege vulnerability categorized as CWE-787, an out-of-bounds write. CVSS 3.1 scores it 7.0: local attack vector, low privileges required, high complexity, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impacts.
Likely exposure
Exposure applies to the listed Windows 10 releases, Windows 11 version 21H2, Windows Server 2019, Windows Server 2022, and Windows Server version 20H2, including the listed Server Core installation. Inventory and update status are required to determine actual exposure.
Exploitation context
CISA's Known Exploited Vulnerabilities catalog supports active exploitation in the wild. The supplied evidence does not describe attack campaigns, exploitation prevalence, or initial-access methods. The CVSS vector indicates an attacker needs low-privileged local access and faces high attack complexity.
Researcher notes
The available evidence identifies Win32k, elevation of privilege, and CWE-787 but does not provide the vulnerable function, root cause details, exploit artifacts, or detection indicators. Validate exposure through Microsoft's product-specific update guidance and installed-update evidence; do not infer vulnerability from operating-system family alone.
Mitigation direction
- Apply the applicable Microsoft security update identified in the MSRC advisory.
- Prioritize affected systems accessible to untrusted or previously compromised local users.
- Restrict unnecessary local access while remediation is pending.
- Check current Microsoft guidance for product-specific update requirements.
Validation and detection
- Inventory systems running the explicitly listed Windows versions and editions.
- Verify applicable Microsoft security updates are installed successfully.
- Confirm systems no longer report the relevant update as missing.
- Monitor affected hosts for suspicious privilege-elevation activity.
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-787: 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2022-21882 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
- High
- CVSS
- 7 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
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.
CISA KEV status
SSVC decision data
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:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C15.9microsoftVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2022-21882 added to CISA KEV
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2022-02-04T00:00:00.000Z: CVE-2022-21882 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- Win32k Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21882CVE reference, CVE · x_refsource_MISC, x_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-21882CVE reference, CISA-ADP · government-resource
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.