Threat operations/Case file
AL
Member accessPublic view · sign in

Vulnerability threat dossier

CVE-2025-53770

microsoftsharepoint server

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.

VTP deterministic threat62.0of 100 · CVSS excluded

VTP analyst assessment

SharePoint pre-authentication deserialization RCE

AI-assisted analytical recommendationDoes not set factual exploitation state
AI review stateREVIEWED
AI priorityNONE
AI confidence95%
Public exploitation · VTP factKEV

Assessment

Critical deserialization vulnerability in on-premises SharePoint Server permitting unauthenticated network code execution. Supplied KEV context and independent ENISA EU KEV evidence establish known global exploitation.

Why it matters

  • The pre-authentication, network-reachable path can produce complete confidentiality, integrity, and availability impact.
  • CVSS is 9.8 and EPSS is 0.99998, although EPSS remains predictive rather than exploitation evidence.

Evidence

1 record references and 1 source references passed trusted post-response validation. The current deterministic record contains 1 independent evidence group.

Uncertainties

The supplied source does not describe exploitation volume, techniques, or affected organizations.

Local SharePoint exposure, mitigation status, and compromise are unknown without first-party telemetry.

First-party sensor telemetry is active; no disclosure-eligible deterministic observation is currently public for this CVE. This does not mean no activity was observed.

Next watchpoint

On-premises SharePoint 2016, 2019, or Subscription Edition instances matching affected versions.

AI baseline history (2)
  1. BASELINE ASSESSED
    SharePoint pre-authentication deserialization RCEgpt-5.6-sol · high
  2. BASELINE ASSESSED
    Microsoft SharePoint unauthenticated deserialization RCEgpt-5.6-sol · high
Technical severityCRITICALCVSS 9.8 · technical context
Public exploitationKEVGlobal public evidence
Exploit maturityTECHNICAL DETAILSReliability not implied
EPSS1.00100th percentile · prediction
Evidence confidence95%Strongest independent active claim
VelocitySTABLEMaterial events only
First-party telemetryFirst-party sensor telemetry is active; no disclosure-eligible deterministic observation is currently public for this CVE. This does not mean no activity was observed.
Availability: SENSOR_ONLINE_NO_MATCHING_ACTIVITY · Evidence: UNKNOWN
01

VTP deterministic assessment

Why this matters

  1. 01

    CISA KEV lists this vulnerability as known to be exploited globally.

  2. 02

    EPSS is 1.00; this is predictive context, not exploitation evidence.

  3. 03

    First-party sensor telemetry is active; no disclosure-eligible deterministic observation is currently public for this CVE. This does not mean no activity was observed.

02

Material change ledger

What changed

KEV ADDEDCISA KEV entry added
03

Claim provenance

Evidence and source independence

1publications detected
1underlying evidence chains

1 primary sources · 0 dependent secondary reports · 0 reports with unresolved independence. Repetition remains visible without multiplying confirmation.

Source claimACTIVE EXPLOITATIONENISA EU KEV LISTED
95%claim confidence
INDEPENDENTcatalog:enisa-eu-kev:CVE-2025-53770ACTIVE
Evidence
04

Event history

Threat timeline

  1. 00:0020 Jul
    ACTIVE EXPLOITATION

    ENISA EU KEV entry added

    ENISA EU KEV reports known exploitation. VTP imported this historical entry as source baseline. This is public intelligence, not a VTP sensor observation.

  2. 00:0020 Jul
    KEV ADDED

    CISA KEV entry added

    CISA lists global known exploitation. This is not a VTP sensor observation.

05

Original publications

Source record

ENISA European Vulnerability DatabaseAUTHORITATIVEINDEPENDENT

ENISA EU KEV catalog membership for CVE-2025-53770

ENISA EU KEV lists this vulnerability as known to be exploited. This is public intelligence, not a VTP sensor observation.

CVE-2025-53770
Separate evidence group
Original
06

Technical vulnerability data

Context, not threat proof

VTP threat score62.0vtp-threat-v1-public
Public exploitation30 / 30
EPSS prediction20 / 20
Exploit availability2.5 / 15
Source independence7.5 / 15
Intelligence recency2 / 10
Threat acceleration0 / 10
CVSS technical severityExcluded
CVSS
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-502
CPE records
3
Deterministic history records
20
Primary technical reference
07

Raw observations

First-party sensor records

First-party sensor telemetry is active; no disclosure-eligible deterministic observation is currently public for this CVE. This does not mean no activity was observed.