Security readout for executives and security teams
Plain-English summary
CVE-2021-24083 is a Microsoft Windows Address Book remote code execution vulnerability. The supplied CVSS data rates it high because successful exploitation could allow code execution with major confidentiality, integrity, and availability impact. The vector requires local attack conditions and user interaction, so urgency is high but not worm-like from the evidence provided.
Executive priority
Treat as a high-priority legacy Windows remediation item. It is not KEV-listed in the supplied evidence, but the potential impact is full system compromise. Focus on confirming patch coverage across older Windows clients and servers.
Technical view
The issue affects multiple Windows client and server versions, including Windows 7, 8.1, Windows 10 1507 through 20H2, Server 2008 R2, 2012, 2016, 2019, and Server Core variants. CVSS 3.1 is 7.8 with AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Microsoft lists an official remediation level.
Likely exposure
Exposure is most likely on listed Windows systems that did not receive the Microsoft security update for this CVE. Client endpoints deserve particular attention because the score requires user interaction. Server Core and server versions are also listed as affected in the source bundle.
Exploitation context
The supplied evidence does not show active exploitation, and the CVE is not marked as CISA KEV. CVSS exploit maturity is listed as unproven. Do not assume exploitation in the wild from this bundle alone; treat it as a serious patching issue because impact is complete compromise of affected systems.
Researcher notes
The notable nuance is the mismatch between the RCE title and CVSS local attack vector with required user interaction. The bundle does not provide root cause, exploit primitives, or file-handling details, so validation should stay asset-and-patch focused unless Microsoft guidance supplies more detail.
Mitigation direction
- Apply the Microsoft security update referenced by the MSRC advisory.
- Prioritize listed Windows clients and servers missing February 2021-era security updates.
- Upgrade, isolate, or retire affected systems that cannot receive vendor fixes.
- Use endpoint controls to reduce user-assisted execution of untrusted content.
Validation and detection
- Inventory Windows versions against the affected product list in the CVE bundle.
- Confirm patch status using Microsoft guidance and enterprise patch management records.
- Check vulnerability scanner findings for CVE-2021-24083 on listed Windows assets.
- Validate exception lists for systems that cannot be patched promptly.
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-2021-24083 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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-2021-24083CVE 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.