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Junos OS on MX Series With SPC3

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medium advisory

CVE-2026-57023: Juniper Junos OS TCP Proxy Denial of Service

An Improper Validation of Specified Quantity in Input vulnerability (CVE-2026-57023) 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) by sending a specifically malformed TCP header packet, crashing the flow processing daemon (flowd) until automated recovery.

Junos OS on MX Series with SPC3 +1 denial-of-service vulnerability network juniper
1t 1c