CVE-2021-27857Public exploitNetwork attack vector

Unauthenticated configuration disclosure via predictable backup path

Published Dec 15, 2021 · Updated Sep 17, 2024

Missing authorization in FatPipe WARP, IPVPN, and MPVPN before 10.1.2r60p91 and 10.2.2r42 allows remote attackers to download configurations. The /fpui/ archive path serves a backup without authorization when its filename combines the hostname, product marker, and version. No credentials are required, but the archive name must be known or guessed; successful access exposes passwords, VPN secrets, and network configuration.

CVSS severity7.5
High
EPSS probability1.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in FatPipe WARP, IPVPN, and MPVPN before 10.1.2r60p91 and 10.2.2r42 allows remote attackers to download configurations. The /fpui/ archive path serves a backup without authorization when its filename combines the hostname, product marker, and version. No credentials are required, but the archive name must be known or guessed; successful access exposes passwords, VPN secrets, and network configuration.

The record

CVE
CVE-2021-27857
Published
Dec 15, 2021
Updated
Sep 17, 2024
Vendor
FatPipe
Product
MPVPN
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1 <10.1.2r60p91
  2. Affected versionversion=10.2 <10.2.2r42

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FatPipe · MPVPNversion=10.1 <10.1.2r60p91; version=10.2 <10.2.2r42
FatPipe · IPVPNversion=10.1 <10.1.2r60p91; version=10.2 <10.2.2r42
FatPipe · WARPversion=10.1 <10.1.2r60p91; version=10.2 <10.2.2r42

Published CVSS scores

7.5CERT/CC CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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