SB2026070857 - Improper validation of specified quantity in input in Junos OS

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Main Vulnerability Database SB2026070857

SB2026070857 - Improper validation of specified quantity in input in Junos OS

Published: July 8, 2026

Security Bulletin ID SB2026070857
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper validation of specified quantity in input (CVE-ID: CVE-2026-57023)

CWE-ID: CWE-1284 - Improper Validation of Specified Quantity in Input

CVSSv4: 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


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.


Remediation

Install update from vendor's website.

References