Improper validation of specified quantity in input in Junos OS - CVE-2026-57023
Published: July 8, 2026
Vulnerability identifier: #VU137143
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-57023
CWE-ID: CWE-1284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Junos OS
Junos OS
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper validation of specified quantity in input error in the TCP proxy plugin. A remote non-authenticated attacker can cause a complete Denial of Service (DoS).
When TCP proxy is engaged in a flow session, to support ALGs, Advanced Anti-Malware, ICAP or UTM, a TCP packet with specifically malformed TCP header will cause flow processing daemon (flowd) to crash and restart.
This causes a complete service outage until the system has automatically recovered.
How to mitigate CVE-2026-57023
Install updates from vendor's website.