How severe is CVE-2021-27860?

CVE-2021-27860 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-27860?

Affected package information for CVE-2021-27860 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-27860?

No fixed version has been published for CVE-2021-27860 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-27860 actively exploited in the wild?

Yes. There are 3 known exploit references for CVE-2021-27860, including 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-27860?

CVE-2021-27860 has an EPSS (Exploit Prediction Scoring System) score of 39.7%, placing it in the 97th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is CVE-2021-27860 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-27860 (FatPipe WARP, IPVPN, and MPVPN Configuration Upload exploit) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-01-10. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-01-24. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2021-27860?

CVE-2021-27860 is classified as Unrestricted File Upload (CWE-434). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2021-27860?

CVE-2021-27860 affects fatpipeinc ipvpn firmware (6 versions, e.g. 5.2.0, 6.1.2, 7.1.2…); fatpipeinc mpvpn firmware (6 versions, e.g. 5.2.0, 6.1.2, 7.1.2…); fatpipeinc warp firmware (6 versions, e.g. 5.2.0, 6.1.2, 7.1.2…). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2021-27860 published, and has it been updated?

CVE-2021-27860 was published on December 8, 2021 and was last updated on October 24, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-01-10 — agencies required to remediate by 2022-01-24

CVE-2021-27860

CRITICAL

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…

Published

Dec 8, 2021

Updated

Oct 24, 2025

Affected

0 pkgs

Patched

None yet

Exploits

3 known

EPSS Exploitation Probability

via FIRST.org ↗

39.7%probability of exploitation in next 30 days

Moderate Risk97th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

3 products · 108 configurations

ipvpn firmwarefatpipeinc

6 versions

5.2.06.1.27.1.29.1.210.1.210.2.2

mpvpn firmwarefatpipeinc

6 versions

5.2.06.1.27.1.29.1.210.1.210.2.2

warp firmwarefatpipeinc

6 versions

5.2.06.1.27.1.29.1.210.1.210.2.2

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A vulnerability in the web management interface of FatPipe WARP, IPVPN, …

zeroscience.mkNVDDec 2021

A vulnerability in the web management interface of FatPipe WARP, IPVPN, …

cisa.govCISAJan 2022

A vulnerability in the web management interface of FatPipe WARP, IPVPN, …

ic3.govNVDJul 2024

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-27860 in your stack?

O3 detects CVE-2021-27860 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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