Security readout for executives and security teams
Plain-English summary
CVE-2020-1595 is a critical SharePoint flaw that can let an authenticated attacker run code on the SharePoint server. Successful exploitation could execute under powerful SharePoint service contexts, creating serious risk to documents, workflows, and connected farm services.
Executive priority
Treat this as urgent for any externally reachable or broadly accessible SharePoint farm. The impact is server-side code execution under privileged SharePoint contexts, so delay increases business risk even without confirmed exploitation evidence.
Technical view
Microsoft describes unsafe input handling in SharePoint APIs, specifically deserialization of untrusted data. A low-privileged network attacker can target a susceptible API with specially formatted input and may gain code execution in the SharePoint application pool and server farm account contexts.
Likely exposure
Exposure is likely in on-premises Microsoft SharePoint Enterprise Server 2013 SP1, Foundation 2013 SP1, Enterprise Server 2016, and Server 2019 deployments that have not applied Microsoft’s CVE-2020-1595 security update.
Exploitation context
The provided sources do not show active exploitation, and KEV is false. The CVSS vector indicates network reachability, low attack complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Researcher notes
Focus validation on product/version matching, patch state, and reachability of affected SharePoint APIs. Do not assume exploitation in the environment from the bundle alone; the evidence supports high theoretical impact, not confirmed active abuse.
Mitigation direction
- Apply Microsoft’s security update for CVE-2020-1595 to affected SharePoint versions.
- Prioritize internet-facing and partner-accessible SharePoint farms.
- Confirm Microsoft guidance before relying on any temporary workaround.
- Restrict unnecessary access to susceptible SharePoint APIs where operationally possible.
Validation and detection
- Inventory SharePoint farms for the affected 2013 SP1, 2016, and 2019 products.
- Verify installed update status against Microsoft’s CVE-2020-1595 advisory.
- Confirm exposed farms are not running unpatched affected builds.
- Review SharePoint access logs for unexpected API usage patterns.
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-2020-1595 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
- Critical
- CVSS
- 9.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/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:C/C:H/I:H/A:H/E:P/RL:O/RC:C3.16Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1595CVE 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.