CVE-2026-57021
Severity CVSS v4.0:
MEDIUM
Type:
CWE-787
Out-of-bounds Write
Publication date:
09/07/2026
Last modified:
09/07/2026
Description
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).<br />
<br />
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.<br />
<br />
This issue affects Junos OS on SRX Series:<br />
<br />
<br />
* 23.2 versions before 23.2R2-S7,<br />
* 23.4 versions before 23.4R2-S8,<br />
* 24.2 versions before 24.2R2-S4,<br />
* 24.4 versions before 24.4R2-S4,<br />
* 25.2 versions before 25.2R2,<br />
* 25.4 versions before 25.4R1-S1, 25.4R2.
Impact
Base Score 4.0
6.90
Severity 4.0
MEDIUM
Base Score 3.x
5.30
Severity 3.x
MEDIUM