Security readout for executives and security teams
Plain-English summary
CVE-2020-16979 is a Microsoft SharePoint information disclosure flaw. A logged-in attacker could potentially obtain sensitive information over the network without user interaction, but exploitation is rated high complexity. The business concern is confidentiality exposure in affected on-premises SharePoint deployments.
Executive priority
Treat this as a moderate confidentiality risk. It should be handled through normal patch governance, with higher urgency for exposed or sensitive SharePoint environments.
Technical view
The CVSS 3.1 vector is 5.3 medium: AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N. The provided affected products are SharePoint Foundation 2013 SP1, SharePoint Enterprise Server 2016, and SharePoint Server 2019. Integrity and availability impact are not indicated.
Likely exposure
Exposure is likely limited to organizations running the listed on-premises SharePoint versions. The sources do not identify other Microsoft products or cloud services as affected.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. CVSS temporal data marks exploit code maturity as unproven, while remediation level indicates an official fix exists.
Researcher notes
The public data is sparse: it identifies affected products, CVSS characteristics, and Microsoft advisory linkage, but not root cause details. Avoid assuming exploitability beyond authenticated network access and high complexity.
Mitigation direction
- Review Microsoft MSRC guidance for CVE-2020-16979.
- Apply the official Microsoft security update applicable to affected SharePoint versions.
- Prioritize internet-exposed or broadly accessible SharePoint farms.
- Restrict SharePoint access to trusted authenticated users where possible.
Validation and detection
- Inventory SharePoint Foundation 2013 SP1, Enterprise Server 2016, and Server 2019 deployments.
- Confirm each deployment's patch status against the MSRC advisory.
- Check whether affected SharePoint sites are externally reachable.
- Review access controls for sensitive SharePoint content.
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-2020-16979 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
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/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:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C1.63.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/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-2020-16979CVE 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.