CVE intelligence and bounded remediation

CVE-2021-27860 — FatPipe WARP, IPVPN, and MPVPN Configuration Upload exploit

Critical CVSS 9.8 CISA KEV

A vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p92 and 10.2.2r44p1 allows a remote, unauthenticated attacker to upload a file to any location on the filesystem. The FatPipe advisory identifier for this vulnerability is FPSA006.

Severity
Critical
CVSS
9.8 (3.1)
Published
2021-12-08
CISA KEV
Known exploited
Ecosystem
operating-system
Weaknesses
CWE-434

Affected products

  • fatpipeinc / ipvpn_firmware / 5.2.0
  • fatpipeinc / ipvpn_firmware / 6.1.2
  • fatpipeinc / ipvpn_firmware / 7.1.2
  • fatpipeinc / ipvpn_firmware / 9.1.2

Showing 4 representative product identities from 108 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Path traversal, unsafe upload, and file handling

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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