Out-of-Bounds Write Vulnerability in Juniper Networks Junos OS on SRX Series
CVE-2026-57021

6.9MEDIUM

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Vendor
CVE Published:
9 July 2026

Badges

👾 Exploit Exists

What is CVE-2026-57021?

An Out-of-bounds Write vulnerability exists in Juniper Networks Junos OS affecting SRX Series devices. An unauthenticated attacker can exploit this flaw by sending specially crafted requests to the http-gatekeeper (http-gk). This exploitation may result in a process crash, causing service disruptions including unavailability of J-Web, remote access VPN services, and firewall authentication. Affected devices will require automatic restarts of the http-gk process to regain service functionality.

Affected Version(s)

Junos OS SRX Series 23.2 < 23.2R2-S7

Junos OS SRX Series 23.4 < 23.4R2-S8

Junos OS SRX Series 24.2 < 24.2R2-S4

References

https://supportportal.juniper.net/JSA110081
vendor-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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