Security readout for executives and security teams
Plain-English summary
CVE-2025-21348 is a high-severity remote code execution issue in on-premises Microsoft SharePoint Server. It requires a highly privileged attacker, but successful exploitation could fully affect confidentiality, integrity, and availability. Organizations running affected SharePoint Server versions should treat patching as a priority.
Executive priority
Patch in the normal high-severity emergency window, especially for exposed or business-critical SharePoint systems. There is no supplied evidence of active exploitation, but the potential impact is full system compromise under a privileged attack scenario.
Technical view
The CVSS 3.1 vector is 7.2: network reachable, low attack complexity, no user interaction, high privileges required, unchanged scope, and high impact to confidentiality, integrity, and availability. The source bundle maps the issue to CWE-285 and lists Microsoft remediation as available.
Likely exposure
Exposure is limited to listed on-premises Microsoft SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition deployments. The supplied affected data identifies version 16.0.0 for each product. SharePoint Online is not listed in the supplied affected products.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS exploit maturity value is unproven. The high-privilege requirement reduces mass exploitation likelihood, but impact remains serious if a privileged SharePoint account is compromised.
Researcher notes
Public source detail is limited. The key constraints are PR:H, AV:N, AC:L, UI:N, and CWE-285. Avoid assuming unauthenticated exploitation. Research should focus on affected on-premises SharePoint builds and Microsoft’s advisory history for exact fixed versions.
Mitigation direction
- Apply the Microsoft security update for CVE-2025-21348 from the MSRC advisory.
- Inventory all on-premises SharePoint Server 2016, 2019, and Subscription Edition instances.
- Prioritize internet-facing or high-value SharePoint deployments for remediation.
- Review privileged SharePoint account access until updates are confirmed.
- Check Microsoft guidance for any product-specific prerequisites or follow-up steps.
Validation and detection
- Confirm each SharePoint server product and version against the affected list.
- Verify the Microsoft CVE-2025-21348 update is installed on every affected server.
- Confirm no unsupported or unpatched SharePoint instance remains in production.
- Review vulnerability scanner results for CVE-2025-21348 after patching.
- Document remediation status for each SharePoint farm or standalone server.
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.
CWE-285: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution 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-2025-21348 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
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/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.
SSVC decision data
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:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.25.9microsoftVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft SharePoint Server Remote Code Execution VulnerabilityCVE reference, microsoft · vendor-advisory, patch
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.
Improper Authorization
Improper Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.