SEPTEMBER 19, 2026
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Case File

CVE-2026-57021

MEDIUM · CVSS 5.3 EPSS 0.34%

Source: NVD + CISA KEV + EPSS · Published 2026-07-09 · Last synced 2026-08-08

CyberRota Analysis

AI-Generated

An Out-of-bounds Write vulnerability in the http-gatekeeper component of Juniper Networks Junos OS on SRX Series devices allows unauthenticated network-based attackers to exploit this flaw, potentially leading to a Denial-of-Service (DoS) condition. This can result in the unavailability of critical services such as J-Web, remote access VPN, and firewall authentication until the affected process restarts. Organizations using the specified versions of Junos OS on SRX Series devices, especially those with remote-access VPN configured, should prioritize applying patches to mitigate this risk.

CVE
CVE-2026-57021
Severity
MEDIUM
CVSS
5.3
EPSS
0.34%

Original NVD 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). 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.

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