CVE-2021-27856 json
FatPipe software administrative account with no password
published 2021-12-15 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14594
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.5%
- EPSS 5.5% chance of exploitation in 30 days, percentile 92%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- FatPipe WARP 10.1.2r60p91, 10.2.2r42
- FatPipe IPVPN 10.1.2r60p91, 10.2.2r42
- FatPipe MPVPN 10.1.2r60p91, 10.2.2r42
Exploit prediction
5.47% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template FatPipe WARP/IPVPN/MPVPN - Backdoor Account nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- FatPipe WARP
- FatPipe IPVPN
- FatPipe MPVPN
References
-
fatpipeinc.com
/support/cve-list.php
vendor-advisory
-
zeroscience.mk
/en/vulnerabilities/ZSL-2021-5684.php
third-party-advisory
-
zeroscience.mk
/codes/fatpipe_backdoor.txt
third-party-advisory
Sources
- CVE List CVE-2021-27856
- NVD CVE-2021-27856
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