CVE Intelligence
CISA KEV High File handling exploit reference

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

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.

Published Dec 8, 2021 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, NIST National Vulnerability Database, GitHub Security Advisories, CVE Program (cve.org) e CISA ADP · CNA: certcc

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Jan 10, 2022
How the score was calculated
  • Confirmed exploitation (CISA KEV)+35
  • EPSS 39.7% (30-day exploitation probability)+15
  • Technical severity (high)+6
  • Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Confirmed
CISA KEV, listed Jan 10, 2022
EPSS FIRST
39.68%
ahead of 99% of scored CVEs · Oct 15, 2026
Affects
FatPipe
IPVPN and 5 more
CVSS base
8.8
High · 4 source(s)
Prioritization reference: 9.8 provisional

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
Active
none · proof-of-concept · active
Automatable
Yes
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Documented mitigation — www.ic3.gov (NIST National Vulnerability Database)

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: Jan 24, 2022 — passed 1726 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (FatPipe IPVPN, FatPipe MPVPN, FatPipe WARP…).
  2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
  3. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  4. Apply the documented mitigations until a definitive fix is available.
  5. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
  6. EPSS ahead of 99% of scored CVEs: prioritize it in the patch queue.
  7. Search available logs for exploit probes matching the vulnerability class (file handling), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
FatPipe IPVPN ≥ 10.1 and < 10.1.2r60p92≥ 10.2 and < 10.2.2r44p1 Vulnerable CVE Program (cve.org) e CISA ADP
FatPipe MPVPN ≥ 10.1 and < 10.1.2r60p92≥ 10.2 and < 10.2.2r44p1 Vulnerable CVE Program (cve.org) e CISA ADP
FatPipe WARP ≥ 10.1 and < 10.1.2r60p92≥ 10.2 and < 10.2.2r44p1 Vulnerable CVE Program (cve.org) e CISA ADP
Fatpipeinc Ipvpn Firmware version 5.2.0-r34version 6.1.2-r70p26version 6.1.2-r70p45-mversion 6.1.2-r70p75-mversion 7.1.2-r39version 9.1.2-r129version 9.1.2-r144version 9.1.2-r150
and 28 more version 9.1.2-r156version 9.1.2-r161p12version 9.1.2-r161p16version 9.1.2-r161p17version 9.1.2-r161p2version 9.1.2-r161p20version 9.1.2-r161p26version 9.1.2-r161p3version 9.1.2-r164version 9.1.2-r164p4version 9.1.2-r164p5version 9.1.2-r165version 9.1.2-r180p2version 9.1.2-r185version 10.1.2-r60p10version 10.1.2-r60p13version 10.1.2-r60p32version 10.1.2-r60p35version 10.1.2-r60p45version 10.1.2-r60p55version 10.1.2-r60p58version 10.1.2-r60p58s1version 10.1.2-r60p65version 10.1.2-r60p71version 10.1.2-r60p82version 10.2.2-r10version 10.2.2-r25version 10.2.2-r38
Vulnerable NIST National Vulnerability Database
Fatpipeinc Mpvpn Firmware version 5.2.0-r34version 6.1.2-r70p26version 6.1.2-r70p45-mversion 6.1.2-r70p75-mversion 7.1.2-r39version 9.1.2-r129version 9.1.2-r144version 9.1.2-r150
and 28 more version 9.1.2-r156version 9.1.2-r161p12version 9.1.2-r161p16version 9.1.2-r161p17version 9.1.2-r161p2version 9.1.2-r161p20version 9.1.2-r161p26version 9.1.2-r161p3version 9.1.2-r164version 9.1.2-r164p4version 9.1.2-r164p5version 9.1.2-r165version 9.1.2-r180p2version 9.1.2-r185version 10.1.2-r60p10version 10.1.2-r60p13version 10.1.2-r60p32version 10.1.2-r60p35version 10.1.2-r60p45version 10.1.2-r60p55version 10.1.2-r60p58version 10.1.2-r60p58s1version 10.1.2-r60p65version 10.1.2-r60p71version 10.1.2-r60p82version 10.2.2-r10version 10.2.2-r25version 10.2.2-r38
Vulnerable NIST National Vulnerability Database
Fatpipeinc Warp Firmware version 5.2.0-r34version 6.1.2-r70p26version 6.1.2-r70p45-mversion 6.1.2-r70p75-mversion 7.1.2-r39version 9.1.2-r129version 9.1.2-r144version 9.1.2-r150
and 28 more version 9.1.2-r156version 9.1.2-r161p12version 9.1.2-r161p16version 9.1.2-r161p17version 9.1.2-r161p2version 9.1.2-r161p20version 9.1.2-r161p26version 9.1.2-r161p3version 9.1.2-r164version 9.1.2-r164p4version 9.1.2-r164p5version 9.1.2-r165version 9.1.2-r180p2version 9.1.2-r185version 10.1.2-r60p10version 10.1.2-r60p13version 10.1.2-r60p32version 10.1.2-r60p35version 10.1.2-r60p45version 10.1.2-r60p55version 10.1.2-r60p58version 10.1.2-r60p58s1version 10.1.2-r60p65version 10.1.2-r60p71version 10.1.2-r60p82version 10.2.2-r10version 10.2.2-r25version 10.2.2-r38
Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
9.8 CVSS 3.1 Critical 3.9 5.9 cret@cert.org via NIST National Vulnerability Database
9.8 CVSS 3.1 Critical — — certcc via CVE Program (cve.org) e CISA ADP
8.8 CVSS 3.1 High 2.8 5.9 nvd@nist.gov via NIST National Vulnerability Database
8.8 CVSS 3.1 High — — GitHub, Inc. via GitHub Security Advisories
9.3 CVSS 2.0 High 8.6 10.0 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)
Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 9.8 (cret@cert.org via NIST National Vulnerability Database) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-434 · Unrestricted Upload of File with Dangerous Type

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed
Jan 10, 2022
Federal deadline
Jan 24, 2022
passed 1726 day(s) ago
Ransomware use
Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

EPSS over time FIRST

Oct 13, 2026 → Oct 15, 2026 · 3 reading(s) · max 39.68%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Monitor file creation in web directories and paths with traversal sequences (../).
  • Hunt retroactively in logs from before Jan 10, 2022 (KEV listing): exploitation may have started earlier.
web/proxy/WAF logsnetwork IDS/IPSfile integrity (FIM)endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · fatpipe/warp, fatpipe/ipvpn, fatpipe/mpvpn
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Fix documented
    Oct 13, 2026 · NIST National Vulnerability Database
  • Affected products added · fatpipeinc/ipvpn firmware, fatpipeinc/warp firmware, fatpipeinc/mpvpn firmware
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 8.8
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Added to CISA KEV (detected)
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • Record created in this database
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • 2022
  • Added to CISA KEV catalog
    Jan 9, 2022 · CISA
  • 2021
  • CVE published
    Dec 8, 2021 · certcc

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 13, 2026 – Oct 13, 2026
  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

6 on the record

Elsewhere on this site

FatPipe
every CVE for this vendor
2022-01
what else CISA listed that month
File handling
same class
CWE-434
other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2021-27860 is "FatPipe WARP, IPVPN, and MPVPN Configuration Upload exploit", rated High. It affects IPVPN (FatPipe); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 8.8 describes technical severity. EPSS 39.68% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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