Security readout for executives and security teams
Plain-English summary
FatPipe VPN appliances could let an unauthenticated internet user download a configuration backup if they can determine the device hostname. That archive may expose sensitive network configuration, making follow-on intrusion easier. The issue affects WARP, IPVPN, and MPVPN before the fixed releases named by FatPipe.
Executive priority
Prioritize remediation for internet-facing FatPipe appliances because the flaw can disclose sensitive configuration without credentials. The main business risk is exposure of network details that may help attackers plan later compromise.
Technical view
CVE-2021-27857 is a CWE-862 missing authorization flaw in the FatPipe web management interface. A remote unauthenticated attacker can retrieve a configuration archive whose filename incorporates the target hostname. Affected releases include WARP, IPVPN, and MPVPN 10.1 and 10.2 before 10.1.2r60p91 and 10.2.2r42; older versions may also be vulnerable.
Likely exposure
Highest exposure is FatPipe WARP, IPVPN, or MPVPN management interfaces reachable from untrusted networks, especially internet-facing appliances running unfixed 10.1, 10.2, or older versions.
Exploitation context
The CVE is not listed as KEV in the provided bundle, so active exploitation is not established here. Public Zero Science material is cited, including a technical reference, which increases researcher and attacker awareness without proving real-world exploitation.
Researcher notes
The hostname requirement is an important constraint, but the issue remains network-accessible with no credentials or user interaction. The source bundle names fixed release thresholds but does not provide complete coverage details for older versions.
Mitigation direction
- Upgrade affected FatPipe software to 10.1.2r60p91, 10.2.2r42, or later vendor-supported releases.
- Review FatPipe advisory FPSA003 and current vendor guidance for older-version applicability.
- Remove untrusted access to the web management interface where operationally possible.
- Treat exposed configuration archives as sensitive and rotate affected secrets if exposure is suspected.
Validation and detection
- Inventory FatPipe WARP, IPVPN, and MPVPN appliances and record exact software versions.
- Confirm whether any management interfaces are reachable from the internet or untrusted networks.
- Verify appliances are not running versions earlier than 10.1.2r60p91 or 10.2.2r42.
- Review web management logs for unexpected configuration archive download activity.
- Check whether older FatPipe versions remain deployed and require vendor review.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-27857 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5683.phpCVE reference · x_refsource_MISC
- https://www.fatpipeinc.com/support/cve-list.phpCVE reference · x_refsource_CONFIRM
- https://www.zeroscience.mk/codes/fatpipe_configdl.txtCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.