What it is
CVE-2021-27855 is a vulnerability affecting FatPipe WARP and 2 other products. FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 allows a remote, authenticated attacker with...
Vulnerability report
Exploited in the wild
High confidence
Not in CISA KEV
CVE-2021-27855
WARP FatPipe software allows privilege escalation
FatPipe / WARP · affected before 10.1.2r60p91
- Severity
- CVSS 8.8 · High
- Confidence
- High
- Exploit status
- Exploited in the wild
- EPSS
- 1.6%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is high.
Who is affected?
FatPipe / WARP affected before 10.1.2r60p91.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
WARP FatPipe software allows privilege escalation
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.
Vendor
Product
Affected
Status
FatPipe
WARP
Before 10.1.2r60p91
Affected
FatPipe
WARP
Before 10.2.2r42
Affected
FatPipe
IPVPN
Before 10.1.2r60p91
Affected
FatPipe
IPVPN
Before 10.2.2r42
Affected
FatPipe
MPVPN
Before 10.1.2r60p91
Affected
FatPipe
MPVPN
Before 10.2.2r42
Affected
- Published
- 15 Dec 2021
- Exploitation Reported
- 14 Oct 2025
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2021-27855
- zeroscience.mk/en/vulnerabilities/ZSL-2021-5685.php zeroscience.mk · CVE Record https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5685.php
- fatpipeinc.com/support/cve-list.php fatpipeinc.com · CVE Record https://www.fatpipeinc.com/support/cve-list.php
- zeroscience.mk/codes/fatpipe_privesc.txt zeroscience.mk · CVE Record https://www.zeroscience.mk/codes/fatpipe_privesc.txt
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
The Shadowserver
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2025-10-14 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
1.6%
Weaknesses
Timeline
From disclosure to observed exploitation
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2021-27855
Free JSON includes basic KEV fields{
"cve_id": "CVE-2021-27855",
"confidence": "High",
"cvss_score": 8.8,
"cvss_estimated": false,
"epss_score": 0.01604,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
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