{"cve":"CVE-2021-27856","nvd":{"published":"2021-12-15T20:15:08.003","modified":"2026-06-17T03:45:31.703","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["https://www.fatpipeinc.com/support/cve-list.php","https://www.zeroscience.mk/codes/fatpipe_backdoor.txt","https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5684.php","https://www.fatpipeinc.com/support/cve-list.php","https://www.zeroscience.mk/codes/fatpipe_backdoor.txt"],"products":["fatpipeinc:ipvpn_firmware","fatpipeinc:mpvpn_firmware","fatpipeinc:warp_firmware"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-27856","score":0.05469,"percentile":0.92753,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}