IRONSMITHINTEL
CRITICALCVSS9.8
|
Actively Exploited
|CISA KEV|CVE-2021-27860|Auth: none — unauthenticated|Reboot: required|Manual only

FatPipe WARP, IPVPN, and MPVPN Configuration Upload exploit

A vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software allows a remote, unauthenticated attacker to upload a file to any location on the filesystem.

Published Dec 8, 2021 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2022-01-24 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Unrestricted File Upload (CWE-434) vulnerability in FatPipe WARP, IPVPN, and MPVPN software. A vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p92 and 10.2.2r44p1 allows a remote, unauthenticated attacker to upload a file to any location on the filesystem. The FatPipe advisory identifier for this vulnerability is FPSA006. Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

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Phishing link

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Malicious file

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Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

IT Security
Running ipvpn firmware: 5.2.0, 6.1.2, 7.1.2, 9.1.2, 10.1.2, 10.2.2; warp firmware: 5.2.0, 6.1.2, 7.1.2, 9.1.2, 10.1.2, 10.2.2; mpvpn firmware: 5.2.0, 6.1.2, 7.1.2, 9.1.2, 10.1.2, 10.2.2
Real-world incidentsWhat we've seen

Active exploitation documented in the wild. Threat-research write-up: https://www.ic3.gov/Media/News/2021/211117-2.pdf

How to patch

Manual remediation steps

Apply the Vendor Patch

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog — apply the vendor's security update as soon as possible.

CISA required action: Apply updates per vendor instructions.

References

    1
    Vendor advisory: https://www.fatpipeinc.com/support/cve-list.php
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2021-27860
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27860
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