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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.

PUBLISHED Reserved 2026-06-23 | Published 2026-07-09 | Updated 2026-07-10 | Assigner juniper




MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:A/RE:M

Problem types

CWE-787 Out-of-bounds Write

Product status

Default status
unaffected

23.2 (custom) before 23.2R2-S7
affected

23.4 (custom) before 23.4R2-S8
affected

24.2 (custom) before 24.2R2-S4
affected

24.4 (custom) before 24.4R2-S4
affected

25.2 (custom) before 25.2R2
affected

25.4 (custom) before 25.4R1-S1, 25.4R2
affected

References

supportportal.juniper.net/JSA110081 vendor-advisory

cve.org (CVE-2026-57021)

nvd.nist.gov (CVE-2026-57021)

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