Security readout for executives and security teams
Plain-English summary
CVE-2021-28344 is a Microsoft Windows Remote Procedure Call Runtime remote code execution vulnerability. The provided CVSS score is 8.8, meaning compromise could affect confidentiality, integrity, and availability. It requires low privileges, so it is not described as unauthenticated in the supplied data.
Executive priority
High priority for Windows patch governance. The issue has severe potential impact, broad platform coverage, and low attack complexity, but supplied evidence does not show active exploitation. Remediate through normal emergency or accelerated patch processes based on asset exposure.
Technical view
The vulnerability affects Microsoft Windows RPC Runtime across multiple Windows client and server versions. CVSS v3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating network reachability, low attack complexity, no user interaction, low required privileges, and high impact.
Likely exposure
Exposure is likely where affected Windows clients or servers remain unpatched, especially legacy Windows 7, Windows 8.1, Server 2008, Server 2016, Server 2019, and Windows 10 builds listed in the source bundle.
Exploitation context
The source bundle does not show CISA KEV listing, and the CVSS exploit maturity is marked unproven. Based only on supplied sources, there is no evidence of active exploitation. Treat exploit status as unknown beyond those signals.
Researcher notes
The provided data lacks vulnerability mechanics, affected RPC interfaces, exploit prerequisites beyond CVSS, and specific KB identifiers. Validation should stay source-grounded: affected OS matching, MSRC update status, RPC exposure review, and exception tracking.
Mitigation direction
- Review Microsoft MSRC guidance for CVE-2021-28344 and apply applicable security updates.
- Prioritize internet-exposed, domain-critical, and legacy Windows systems first.
- Remove or isolate unsupported Windows versions where updates are unavailable.
- Restrict unnecessary network access to Windows RPC services using approved segmentation controls.
- Track remediation by CVE, OS version, and system role.
Validation and detection
- Inventory Windows assets against the affected product list in the source bundle.
- Verify installed Microsoft updates cover CVE-2021-28344 for each affected OS version.
- Check whether any affected hosts expose RPC-reachable services across untrusted networks.
- Confirm Server Core systems are included in patch validation.
- Document exceptions and compensating controls for systems that cannot be updated.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-28344 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/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.
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:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28344CVE 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.