← Vulnerability feed

Vulnerability record · CVE-2021-27856 · published 15 December 2021

CVE-2021-27856: Fatpipeinc ipvpn firmware vulnerability

Fatpipeinc · Ipvpn Firmware

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.

9.8 CVSS 3.1 Critical EPSS 5.6% · top 7.4%
9.8CVSS 3.1 base score, v2 7.5
5.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.fatpipeinc.com/support/cve-list.php Vendor Advisory
https://www.zeroscience.mk/codes/fatpipe_backdoor.txt Third Party Advisory
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5684.php Third Party Advisory
https://www.fatpipeinc.com/support/cve-list.php Vendor Advisory
https://www.zeroscience.mk/codes/fatpipe_backdoor.txt Third Party Advisory
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5684.php Third Party Advisory

Track CVE-2021-27856 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2021-27860FatPipe WARP/IPVPN/MPVPN web interface unrestricted file uploadThe web management interface of FatPipe WARP, IPVPN and MPVPN before 10.1.2r60p92 and 10.2.2r44p1 allows an unauthenticated remote attacker to upload…KEVEPSS 40%analysed8.8CVE-2021-27859Fatpipeinc ipvpn firmware missing authorization vulnerabilityA missing authorization vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 1…EPSS 1.6%8.8CVE-2021-27855Fatpipeinc ipvpn firmware missing authorization vulnerabilityFatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 allows a remote, authenticated attacker with read-only privilege…EPSS 1.6%7.5CVE-2021-27857Fatpipeinc ipvpn firmware missing authorization vulnerabilityA missing authorization vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 1…EPSS 1.8%5.3CVE-2021-27858Fatpipeinc ipvpn firmware missing authorization vulnerabilityA missing authorization vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 1…EPSS 2.7%

Source: NIST National Vulnerability Database (record CVE-2021-27856), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.