Is CVE-2021-27855 actively exploited?

Yes. CVE-2021-27855 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-27855 be exploited remotely?

The attack vector of CVE-2021-27855 has not been classified yet.

What is the CVSS score of CVE-2021-27855?

CVE-2021-27855 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-27855

UNKNOWNCISA KEVIN THE WILD

CVE-2021-27855

Published: April 11, 2026

EPSS:0.81%probability of exploitation in 30 daysPercentile:74.2th

Official Description

FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 allows a remote, authenticated attacker with read-only privileges to grant themselves administrative privileges. Older versions of FatPipe software may also be vulnerable. The FatPipe advisory identifier for this vulnerability is FPSA001.

NVD Source

Technical Analysis

CVE-2021-27855 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-27855 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.