Security readout for executives and security teams
Plain-English summary
CVE-2021-1714 is a high-severity Microsoft Excel remote code execution issue. In business terms, an affected Office or related server component could run attacker-controlled code if a user or service processes malicious Excel content. The available sources do not show active exploitation.
Executive priority
Prioritize remediation as a standard high-severity Office patching item. The impact is severe if triggered, but available sources indicate user interaction is required and do not confirm active exploitation.
Technical view
The source bundle identifies Microsoft Excel RCE with CVSS 3.1 score 7.8: local attack vector, low complexity, no privileges required, and user interaction required. Scope is unchanged, with high confidentiality, integrity, and availability impact. Microsoft lists Office, Excel, Microsoft 365 Apps, Office Online Server, Office Web Apps Server, SharePoint, and Excel Services variants as affected.
Likely exposure
Exposure is most likely on endpoints or document-processing servers running the listed Microsoft Office, Excel, Office Online/Web Apps, SharePoint, or Excel Services versions without the MSRC update for this CVE.
Exploitation context
No source in the bundle states active exploitation. KEV is false, and the CVSS vector marks exploit code maturity as unproven. Treat exploitation as plausible through malicious document handling, but not confirmed as observed in the wild from these sources.
Researcher notes
The bundle provides limited root-cause detail: no CWE is listed, and no exploit details are included. Analysis should stay anchored to MSRC applicability, CVSS vector, and affected CPE/product entries. Avoid broad claims beyond Excel/Office-related processing paths.
Mitigation direction
- Apply Microsoft security updates referenced by MSRC for CVE-2021-1714.
- Prioritize listed Excel and Office installations that process external documents.
- Include Office Online Server, Office Web Apps Server, SharePoint, and Excel Services in patch scope.
- Until patched, limit processing of untrusted Excel content where operationally possible.
- Check Microsoft guidance for product-specific update packages and prerequisites.
Validation and detection
- Inventory systems for the affected Microsoft products and versions in the source bundle.
- Confirm the relevant MSRC update for CVE-2021-1714 is installed.
- Verify document-processing servers are included, not just user workstations.
- Review vulnerability scanner findings against Microsoft product/version applicability.
- Confirm exception lists for Office patching do not include affected systems.
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-2021-1714 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
- Microsoft Excel Remote Code Execution VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1714CVE reference · x_refsource_MISC, x_transferred
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.