Security readout for executives and security teams
Plain-English summary
CVE-2021-1707 is a high-severity remote code execution issue in several on-premises Microsoft SharePoint versions. A successful attacker could gain serious control over confidentiality, integrity, and availability, but the CVSS data indicates they need low-level privileges first. The supplied sources do not show active exploitation.
Executive priority
Treat this as a high-priority patching item for affected SharePoint farms, especially externally reachable systems. It is not KEV-listed in the supplied evidence, so urgency is driven by impact and exposure rather than confirmed active exploitation.
Technical view
Microsoft classifies this as a SharePoint Server remote code execution vulnerability with CVSS 3.1 score 8.8. The vector is network-accessible, low complexity, low privileges required, no user interaction, unchanged scope, and high impact to confidentiality, integrity, and availability. The bundle does not provide CWE or root-cause details.
Likely exposure
Exposure is likely limited to organizations running affected on-premises SharePoint Foundation 2010 SP2, Foundation 2013 SP1, SharePoint Enterprise Server 2016, or SharePoint Server 2019, especially internet-facing, extranet-facing, or broadly accessible internal farms.
Exploitation context
The source bundle marks CISA KEV as false and CVSS exploit maturity as unproven. That means active exploitation is not evidenced here. Risk remains meaningful because exploitation is network-reachable, low complexity, and could cause full data and service compromise after low-privilege access.
Researcher notes
The bundle provides product, CVSS, dates, and Microsoft advisory links but no technical root cause, exploit details, or workaround specifics. Validation should focus on affected-version confirmation, patch state, exposure, and authenticated access paths without assuming unlisted exploit behavior.
Mitigation direction
- Inventory affected on-premises SharePoint versions and exposed farms.
- Apply applicable Microsoft security updates from the MSRC update guide.
- Prioritize internet-facing and partner-accessible SharePoint deployments.
- Restrict SharePoint access while patching where operationally feasible.
- Check Microsoft guidance for version-specific servicing prerequisites.
Validation and detection
- Confirm installed SharePoint version and patch level on each farm.
- Compare each deployment against Microsoft’s affected product list.
- Verify MSRC-listed updates are installed successfully.
- Review access logs for unusual authenticated SharePoint activity.
- Document any unsupported or unpatched SharePoint instances.
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-2021-1707 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
- Microsoft SharePoint Server Remote Code Execution VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1707CVE 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.