How severe is CVE-2021-27855?

CVE-2021-27855 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27855 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27855?

CVE-2021-27855 primarily affects Fatpipeinc Ipvpn Firmware. In total, 108 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27855?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-27855 published?

CVE-2021-27855 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-27855

CVE-2021-27855 is a high-severity vulnerability in Fatpipeinc Ipvpn Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Fatpipeinc Ipvpn Firmware
Published: 2021-12-15
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-27855?: 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.
How severe is CVE-2021-27855?: CVE-2021-27855 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27855 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27855?: CVE-2021-27855 primarily affects Fatpipeinc Ipvpn Firmware. In total, 108 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27855?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-27855 published?: CVE-2021-27855 was published on 2021-12-15 and last updated on 2026-06-17.

References

Affected products (108)

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

More vulnerabilities in Fatpipeinc Ipvpn Firmware

CVE-2021-27856 — Critical (CVSS 9.8): FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 includes an account named "cmuser"…
CVE-2021-27860 — Critical (CVSS 9.8): A vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions…
CVE-2021-27859 — High (CVSS 8.8): A missing authorization vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior…
CVE-2021-27857 — High (CVSS 7.5): A missing authorization vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior…
CVE-2021-27858 — Medium (CVSS 5.3): A missing authorization vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior…

All CVEs affecting Fatpipeinc Ipvpn Firmware →

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