CVE-2021-27860Known exploitationNetwork attack vector

Unauthenticated root code execution via unrestricted configuration upload

Published Dec 8, 2021 · Updated Oct 21, 2025

Unrestricted file upload in FatPipe WARP, IPVPN, and MPVPN before 10.1.2r60p92 and 10.2.2r44p1 allows remote attackers to write files. The /fpui/uploadConfigServlet endpoint accepts a modified unauthenticated HTTP request and writes the supplied file to an attacker-chosen filesystem location. Exposure of the web management interface is sufficient, and a written JSP webshell executes with root privileges, enabling device takeover and access to internal infrastructure.

CVSS severity8.8
High
EPSS probability39.82%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in FatPipe WARP, IPVPN, and MPVPN before 10.1.2r60p92 and 10.2.2r44p1 allows remote attackers to write files. The /fpui/uploadConfigServlet endpoint accepts a modified unauthenticated HTTP request and writes the supplied file to an attacker-chosen filesystem location. Exposure of the web management interface is sufficient, and a written JSP webshell executes with root privileges, enabling device takeover and access to internal infrastructure.

The record

CVE
CVE-2021-27860
Published
Dec 8, 2021
Updated
Oct 21, 2025
Vendor
FatPipe
Product
MPVPN
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2021Exploitation reportedFBI-observed APT exploitation of FatPipe appliances
  2. Dec 8, 2021CVE publishedPublication date reported by the CVE source.
  3. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1 <10.1.2r60p92
  2. Affected versionversion=10.2 <10.2.2r44p1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FatPipe · MPVPNversion=10.1 <10.1.2r60p92; version=10.2 <10.2.2r44p1
FatPipe · IPVPNversion=10.1 <10.1.2r60p92; version=10.2 <10.2.2r44p1
FatPipe · WARPversion=10.1 <10.1.2r60p92; version=10.2 <10.2.2r44p1

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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