Security readout for executives and security teams
Plain-English summary
CVE-2021-1718 is a high-severity tampering vulnerability in Microsoft SharePoint Foundation 2010 Service Pack 2. A successful attack could affect confidentiality, integrity, and availability, but the public source bundle does not describe the exact tampering mechanism. It requires low privileges and user interaction, so exposure depends on who can access and use the affected SharePoint instance.
Executive priority
Treat this as a high-priority legacy SharePoint risk where the affected product is present. It has high potential business impact, but public evidence supplied here does not confirm active exploitation.
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 affected product listed is Microsoft SharePoint Foundation 2010 SP2 version 13.0.0. The source bundle identifies this as a SharePoint Server tampering vulnerability, with Microsoft advisory references, but no CWE or detailed root cause.
Likely exposure
Organizations are most likely exposed if they still operate Microsoft SharePoint Foundation 2010 SP2 and allow authenticated users network access to the service. The vector indicates remote network reachability, low privileges, and required user interaction.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. CVSS exploit maturity is listed as unproven, so treat exploitation status as not confirmed from these sources.
Researcher notes
The public bundle is sparse: no CWE, exploit narrative, or detailed attack path is provided. Validation should focus on product/version confirmation, MSRC update status, access boundaries, and whether user interaction requirements meaningfully reduce exposure.
Mitigation direction
- Review the Microsoft MSRC advisory for CVE-2021-1718.
- Apply Microsoft’s official update or remediation guidance where applicable.
- Restrict access to affected SharePoint instances to trusted users and networks.
- Prioritize replacement or isolation of unsupported legacy SharePoint deployments.
Validation and detection
- Inventory SharePoint deployments for Foundation 2010 SP2 version 13.0.0.
- Compare installed patch status against Microsoft’s CVE-2021-1718 advisory.
- Confirm whether affected instances are reachable from untrusted networks.
- Review authenticated user access paths and interaction points.
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.
CVE-2021-1718 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 Server Tampering VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1718CVE 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.