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CVE-2026-90823 – Unauthenticated Remote Code Execution – FatPipe MPVPN, WARP, and IPVPN 10.1.2r60p10

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Summary

CVE-2026-90823 is a critical stack-based buffer overflow (CWE-121) in the auth_user_pass authentication component of FatPipe Networks’ MPVPN, WARP, and IPVPN appliances. An unauthenticated attacker who can reach the device’s management interface can trigger the flaw with a crafted authentication request, potentially achieving arbitrary code execution as root. The issue carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The /usr/sbin/auth_user_pass binary copies attacker-supplied authentication input into a fixed-size stack buffer without validating its length, resulting in a classic stack-based buffer overflow.
  • Trigger conditions: An oversized or malformed field in an authentication request submitted to the management interface reaches the vulnerable copy operation.
  • Attack vector: Network-based and unauthenticated (no credentials or user interaction required); however, exploitation requires network access to the device’s management interface, which is disabled by default on affected appliances.
  • Impact: Successful exploitation can corrupt stack memory (including saved return addresses), allowing an attacker to redirect execution and run arbitrary code with root privileges — resulting in full compromise of confidentiality, integrity, and availability of the device.

Affected software

  • FatPipe MPVPN, firmware version 10.1.2r60p100
  • FatPipe WARP, firmware version 10.1.2r60p100
  • FatPipe IPVPN, firmware version 10.1.2r60p100

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: The affected 10.1.2r60p100 firmware is end-of-life; contact FatPipe Support to confirm your firmware version and migrate to a currently supported release.
  • Network mitigations: Ensure the management interface remains disabled unless actively required; where it must be enabled, restrict access using WAN access control lists limited to trusted administrative sources, and avoid exposing the management interface to the internet.

References

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