Is CVE-2021-27856 actively exploited?

Yes. CVE-2021-27856 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-27856 be exploited remotely?

The attack vector of CVE-2021-27856 has not been classified yet.

What is the CVSS score of CVE-2021-27856?

CVE-2021-27856 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-27856

UNKNOWNCISA KEVIN THE WILD

CVE-2021-27856

Published: April 11, 2026

EPSS:46.30%probability of exploitation in 30 daysPercentile:97.6th

Official Description

FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 includes an account named "cmuser" that has administrative privileges and no password. Older versions of FatPipe software may also be vulnerable. The FatPipe advisory identifier for this vulnerability is FPSA002.

NVD Source

Risk Analysis

FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 include a 'cmuser' account with administrative privileges and no password. This critical flaw allows unauthorized administrative access. Its inclusion in CISA's KEV catalog confirms active exploitation, making it an urgent security concern. Older versions may also be affected.

This vulnerability is actively exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities catalog. It is remotely exploitable due to the presence of a hardcoded administrative account with no password.

Recommended Action

Upgrade FatPipe WARP, IPVPN, and MPVPN software to versions 10.1.2r60p91, 10.2.2r42, or newer to remove the hardcoded 'cmuser' account. Immediately check for and disable any 'cmuser' accounts with default or no passwords.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-27856 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-2021-27856 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.