CVE-2026-57021

Summary

An Out-of-bounds Write vulnerability in the http-gatekeeper (http-gk) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).

If an SRX Series device is configured for remote-access VPN with pre-logon compliance check, a network-based attacker sending specifically formatted requests can trigger an out of bounds write leading to an http-gk process crash. This crash leads to unavailability of all services depending on the [ system services web-management ] configuration (like J-Web, remote access VPN and firewall authentication) until the process automatically restarts.

This issue affects Junos OS on SRX Series:

  • 23.2 versions before 23.2R2-S7,
  • 23.4 versions before 23.4R2-S8,
  • 24.2 versions before 24.2R2-S4,
  • 24.4 versions before 24.4R2-S4,
  • 25.2 versions before 25.2R2,
  • 25.4 versions before 25.4R1-S1, 25.4R2.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS23.2 < 23.2R2-S7affected
Juniper NetworksJunos OS23.4 < 23.4R2-S8affected
Juniper NetworksJunos OS24.2 < 24.2R2-S4affected
Juniper NetworksJunos OS24.4 < 24.4R2-S4affected
Juniper NetworksJunos OS25.2 < 25.2R2affected
Juniper NetworksJunos OS25.4 < 25.4R1-S1, 25.4R2affected

Weaknesses

  • CWE-787: CWE-787 Out-of-bounds Write

Workarounds

There are no known workarounds for this issue.

References