Security readout for executives and security teams
Plain-English summary
CVE-2021-1719 is a high-severity Microsoft SharePoint elevation of privilege vulnerability. An attacker would need some existing privileges and user interaction, but successful exploitation could compromise confidentiality, integrity, and availability of affected SharePoint servers.
Executive priority
Treat as high priority for SharePoint owners because successful exploitation could affect sensitive content and server integrity, even though active exploitation is not evidenced here.
Technical view
The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, score 8.0. The bundle identifies Microsoft SharePoint Enterprise Server 2016 and SharePoint Server 2019 as affected. No CWE or deeper root-cause detail is provided.
Likely exposure
Organizations running on-premises SharePoint Enterprise Server 2016 or SharePoint Server 2019 should assume possible exposure until version and update status are verified.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. CVSS exploit maturity is marked unproven, and exploitation requires low privileges plus user interaction.
Researcher notes
Available sources provide affected products and CVSS but limited vulnerability mechanics. Avoid assuming exploitability beyond the stated prerequisites: network access, low privileges, and user interaction.
Mitigation direction
- Check Microsoft MSRC guidance for CVE-2021-1719 and applicable updates.
- Prioritize patch verification on internet-accessible or high-value SharePoint deployments.
- Restrict SharePoint access to trusted users and networks where feasible.
- Review privileged SharePoint accounts for unnecessary access.
Validation and detection
- Inventory SharePoint Enterprise Server 2016 and SharePoint Server 2019 instances.
- Confirm whether each instance has Microsoft guidance for CVE-2021-1719 applied.
- Review exposure for externally reachable SharePoint portals.
- Check logs for unusual low-privilege account activity around SharePoint workflows.
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.
Privilege 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-2021-1719 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/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 SharePoint Elevation of Privilege VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1719CVE 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.