What is CVE-2021-27860?

CVE-2021-27860 is a critical-severity vulnerability in Fatpipe Ipvpn, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-12-08.

How severe is CVE-2021-27860?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-27860 known to be exploited?

Yes. CVE-2021-27860 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-01-10), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Arbitrary file upload in Fatpipe Ipvpn

CVE-2021-27860

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.

Vulnerability class: Unrestricted File Upload

Published 2021-12-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.397 (98.6th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.398 · newest: 0.397 · change: -0.001

Affected products

Fatpipe Ipvpn — versions 10.1, 10.2
Fatpipe Mpvpn — versions 10.1, 10.2
Fatpipe Warp — versions 10.1, 10.2
Fatpipeinc Ipvpn
Fatpipeinc Ipvpn Firmware — versions 5.2.0, 6.1.2, 7.1.2
Fatpipeinc Mpvpn
Fatpipeinc Mpvpn Firmware — versions 5.2.0, 6.1.2, 7.1.2
Fatpipeinc Warp
Fatpipeinc Warp Firmware — versions 5.2.0, 6.1.2, 7.1.2

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-01-10. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-01-24.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

www.fatpipeinc.com/support/cve-list.php (Vendor Advisory)
www.ic3.gov/Media/News/2021/211117-2.pdf (US Government Resource, Exploit, Third Party Advisory, Mitigation)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2021-27860?: CVE-2021-27860 is a critical-severity vulnerability in Fatpipe Ipvpn, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-12-08.
How severe is CVE-2021-27860?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-27860 known to be exploited?: Yes. CVE-2021-27860 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-01-10), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.