Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2025-34046

Fanwei E-Office Unauthenticated File Upload

Shanghai Fanwei Network Technology / E-Office · 0 to <= 9.4

View live feed Monitor via API Watch CVE-2025-34046
Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
0.8%
First observed
20 Jul 2026
Last observed
09 Sep 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-34046 is an unauthenticated Fanwei E-Office Unauthenticated File Upload. An unauthenticated file upload vulnerability exists in the Fanwei E-Office <= v9.4 web management interface. The vulnerability affects...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence. Also confirmed by third-party sources.

Who is affected?

Shanghai Fanwei Network Technology / E-Office 0 to <= 9.4.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

An unauthenticated file upload vulnerability exists in the Fanwei E-Office <= v9.4 web management interface

An unauthenticated file upload vulnerability exists in the Fanwei E-Office <= v9.4 web management interface. The vulnerability affects the /general/index/UploadFile.php endpoint, which improperly validates uploaded files when invoked with certain parameters (uploadType=eoffice_logo or uploadType=theme).

An attacker can exploit this flaw by sending a crafted HTTP POST request to upload arbitrary files without requiring authentication. Successful exploitation could enable remote code execution on the affected server, leading to complete compromise of the web application and potentially the underlying system. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-05 UTC.

Vendor Product Affected Status
Shanghai Fanwei Network Technology E-Office Through 9.4 Affected
View vendor advisory (opens in new tab)
Published
26 Jun 2025
Exploitation Reported
30 Jan 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

php

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

The Shadowserver

Recorded 30 Jan 2026

A trusted third party reported exploitation.

Active exploitation observed

Previdian sensor

First observed 20 Jul 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
The Shadowserver First 2026-01-30 00:00 UTC
Previdian 2026-08-09 12:43 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

13

Attempts observed

5

Unique attacker IPs

4

Attacker countries

FI · HU · IN · SC

6

Sensors observed

CVE-2025-34046 exploitation attempts over the last 55 days

Daily events observed by Previdian sensors

Updated 11 Sep 2026

0
1
1
2
1
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
0
4
3
0
0
0
0
0
1
1
0
0
19 Jul 30 Jul 10 Aug 21 Aug 11 Sep

First observed 20 Jul 2026 · Last observed 09 Sep 2026

Pro adds sensor region and window summaries. Enterprise adds raw IPs, paths, User-Agents, and payloads.

Request telemetry access

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
1
13
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

Learn about Pro API access

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

10.0 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

EPSS

0.8%

Weaknesses

Unrestricted Upload of File with Dangerous Type CWE-434

Timeline

From disclosure to observed exploitation

  1. Indicators of compromise added (10)

    Indicators of compromise recorded

  2. Observed by Previdian sensors

    Evidence-backed exploitation signal

  3. Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. CVE published

    Vulnerability disclosed publicly

  5. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

View Pro pricing Read API docs
  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-34046

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2025-34046",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.00787,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 13, "sensors": 6 }
}