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ExploitedNot in CISA KEV yet

CVE-2021-27855

Exploitation confirmed. First attested on 2023-10-22 by GCVE · kevintel, GCVE · shadowserver.

  • Published2021-12-15
  • WeaknessCWE-862

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-12-1520:15CVE publishedNVD
  2. 2023-10-2211:15Listed as exploited by GCVEGCVE
  3. 2023-10-2211:15Exploitation first reportedGCVE

Versions per branch

NVD
Fatpipeinc ipvpn firmwareversion to verify
BranchAffectedFixed in
5.2= 5.2.0no fix published
6.1= 6.1.2no fix published
7.1= 7.1.2no fix published
9.1= 9.1.2no fix published
10.1= 10.1.2no fix published
10.2= 10.2.2no fix published
Fatpipeinc mpvpn firmwareversion to verify
BranchAffectedFixed in
5.2= 5.2.0no fix published
6.1= 6.1.2no fix published
7.1= 7.1.2no fix published
9.1= 9.1.2no fix published
10.1= 10.1.2no fix published
10.2= 10.2.2no fix published
Fatpipeinc warp firmwareversion to verify
BranchAffectedFixed in
5.2= 5.2.0no fix published
6.1= 6.1.2no fix published
7.1= 7.1.2no fix published
9.1= 9.1.2no fix published
10.1= 10.1.2no fix published
10.2= 10.2.2no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • GCVEexploitation2023-10-22
  • CNACVSS 3.18.8known since 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.06.5read 2026-10-23
  • CNAweakness (CWE)CWE-862known since 2026-10-23
  • FIRST EPSSEPSS score1.7 %2026-11-08
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-12-15
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-53hg-58mg-7j38

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.

Is CVE-2021-27855 actively exploited?

Active exploitation of CVE-2021-27855 has not been confirmed. Its EPSS score was 1.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27855?

CVE-2021-27855 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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