CVE-2021-27855
High PUBLISHEDFatPipe software allows privilege escalation
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Dec 15, 2021
- Exploitation Reported
- Oct 14, 2025
- CVSS
- 8.8 High
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| FatPipe |
WARP
|
10.1 to < 10.1.2r60p91 |
Affected |
| FatPipe |
WARP
|
10.2 to < 10.2.2r42 |
Affected |
| FatPipe |
IPVPN
|
10.1 to < 10.1.2r60p91 |
Affected |
| FatPipe |
IPVPN
|
10.2 to < 10.2.2r42 |
Affected |
| FatPipe |
MPVPN
|
10.1 to < 10.1.2r60p91 |
Affected |
| FatPipe |
MPVPN
|
10.2 to < 10.2.2r42 |
Affected |
CVE References
- 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
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2025-10-14 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2025-10-14 00:00:00 UTC · The Shadowserver
Weaknesses (CWE)
-
Missing Authorization
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 9 months ago00:00 UTC · 9 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
16:14 UTC over 4 years ago16:14 UTC · over 4 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 5 years ago00:00 UTC · over 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-27855
{
"cve_id": "CVE-2021-27855",
"title": "FatPipe software allows privilege escalation",
"affected_vendor": "FatPipe",
"affected_product": "WARP, IPVPN, MPVPN",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 8.8,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}