CVE-2023-36841

Summary

CVE-2023-36841 is a Denial of Service (DoS) vulnerability affecting Juniper Networks Junos OS on MX Series. An unauthenticated attacker can exploit this Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) by sending malformed TCP traffic via an interface configured with PPPoE and tcp-mss enabled. The infinite loop caused by the malformed traffic consumes all resources, leading to a manual restart to recover. This issue affects various Junos OS versions including those prior to 20.4R3-S7, 21.1R1 and later, 21.2 versions prior to 21.2R3-S6, 21.3 versions prior to 21.3R3-S5, 21.4 versions prior to 21.4R3-S3, 22.1 versions prior to 22.1R3-S4, 22.2 versions prior to 22.2R3, 22.3 versions prior to 22.3R2-S2, and 22.4 versions prior to 22.4R2.

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