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    CVE-2026-57023

    An Improper Validation of Specified Quantity in Input vulnerability in the TCP proxy plugin of Juniper Networks Junos OS on MX Series with SPC3, and SRX Series allows an unauthenticated, network-based attacker to 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. This issue affects Junos OS on MX with SPC3, and SRX Series:  * 23.4 versions before 23.4R2-S7,  * 24.2 versions before 24.2R2-S4,  * 24.4 versions before 24.4R2-S3, * 25.2 versions before 25.2R2. This issue does not affect releases before 23.4R1.

    Published:Jul 9, 2026
    Last Modified:Jul 10, 2026
    EPS:Jul 9, 2026
    EPSS Score:0.00461
    CVSS Score:7.5

    Affected Products

    Vendor
    Juniper Networks
    Product
    Junos Os

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-57031 (CVSS 5.3) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of…
    CVE-2026-57030 (CVSS 8.2) — A Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in…
    CVE-2026-57027 (CVSS 7.1) — A Missing Release of Memory after Effective Lifetime vulnerability in the packet forwarding engine (pfe) of Ju…
    CVE-2026-57026 (CVSS 8.7) — An Improper Validation of Syntactic Correctness of Input vulnerability in the SIP plugin of Juniper Networks J…
    CVE-2026-57025 (CVSS 6.8) — A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of Juniper Networks Ju…
    CVE-2026-57024 (CVSS 6.9) — A Use of Multiple Resources with Duplicate Identifier vulnerability in the IKE daemon (iked) of Juniper Networ…
    CVE-2026-57022 (CVSS 8.2) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of…
    CVE-2026-57021 (CVSS 6.9) — An Out-of-bounds Write vulnerability in the http-gatekeeper (http-gk) of Juniper Networks Junos OS on SRX Seri…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High