CVE-2021-27855 | FatPipe software allows privilege escalation

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.

Published: 2021-12-15 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-27855 is rated Moderate Risk (60.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.81%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-27855

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-07 1.00% 0.81% -0.19%
2 2025-11-21 0.89% 1.00% +0.11%
3 2025-11-18 — 0.89% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-27855

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
6.5 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 6.4 [email protected]

Weakness enumeration for CVE-2021-27855

Affected software / configurations for CVE-2021-27855

Vendor Product Version Raw CPE
fatpipeinc ipvpn_firmware 5.2.0 cpe:2.3:o:fatpipeinc:ipvpn_firmware:5.2.0:r34:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 6.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:6.1.2:r70p26:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 6.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:6.1.2:r70p45-m:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 6.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:6.1.2:r70p75-m:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 7.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:7.1.2:r39:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r129:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r144:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r150:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r156:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p12:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p16:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p17:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p2:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p20:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p26:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p3:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r164:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r164p4:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r164p5:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r165:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r180p2:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r185:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p10:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p13:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p32:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p35:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p45:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p55:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p58:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p58s1:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p65:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p71:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.1.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.1.2:r60p82:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.2.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.2.2:r10:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.2.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.2.2:r25:*:*:*:*:*:*
fatpipeinc ipvpn_firmware 10.2.2 cpe:2.3:o:fatpipeinc:ipvpn_firmware:10.2.2:r38:*:*:*:*:*:*
fatpipeinc warp_firmware 5.2.0 cpe:2.3:o:fatpipeinc:warp_firmware:5.2.0:r34:*:*:*:*:*:*
fatpipeinc warp_firmware 6.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:6.1.2:r70p26:*:*:*:*:*:*
fatpipeinc warp_firmware 6.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:6.1.2:r70p45-m:*:*:*:*:*:*
fatpipeinc warp_firmware 6.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:6.1.2:r70p75-m:*:*:*:*:*:*
fatpipeinc warp_firmware 7.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:7.1.2:r39:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r129:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r144:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r150:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r156:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r161p12:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r161p16:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r161p17:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r161p2:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r161p20:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r161p26:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r161p3:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r164:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r164p4:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r164p5:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r165:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r180p2:*:*:*:*:*:*
fatpipeinc warp_firmware 9.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:9.1.2:r185:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p10:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p13:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p32:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p35:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p45:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p55:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p58:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p58s1:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p65:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p71:*:*:*:*:*:*
fatpipeinc warp_firmware 10.1.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.1.2:r60p82:*:*:*:*:*:*
fatpipeinc warp_firmware 10.2.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.2.2:r10:*:*:*:*:*:*
fatpipeinc warp_firmware 10.2.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.2.2:r25:*:*:*:*:*:*
fatpipeinc warp_firmware 10.2.2 cpe:2.3:o:fatpipeinc:warp_firmware:10.2.2:r38:*:*:*:*:*:*
fatpipeinc mpvpn_firmware 5.2.0 cpe:2.3:o:fatpipeinc:mpvpn_firmware:5.2.0:r34:*:*:*:*:*:*
fatpipeinc mpvpn_firmware 6.1.2 cpe:2.3:o:fatpipeinc:mpvpn_firmware:6.1.2:r70p26:*:*:*:*:*:*
fatpipeinc mpvpn_firmware 6.1.2 cpe:2.3:o:fatpipeinc:mpvpn_firmware:6.1.2:r70p45-m:*:*:*:*:*:*
fatpipeinc mpvpn_firmware 6.1.2 cpe:2.3:o:fatpipeinc:mpvpn_firmware:6.1.2:r70p75-m:*:*:*:*:*:*
fatpipeinc mpvpn_firmware 7.1.2 cpe:2.3:o:fatpipeinc:mpvpn_firmware:7.1.2:r39:*:*:*:*:*:*
fatpipeinc mpvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:mpvpn_firmware:9.1.2:r129:*:*:*:*:*:*
fatpipeinc mpvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:mpvpn_firmware:9.1.2:r144:*:*:*:*:*:*
fatpipeinc mpvpn_firmware 9.1.2 cpe:2.3:o:fatpipeinc:mpvpn_firmware:9.1.2:r150:*:*:*:*:*:*

References for CVE-2021-27855

cvelogic Threat Intelligence