CVE-2023-44186

<br /> An Improper Handling of Exceptional Conditions vulnerability in AS PATH processing of Juniper Networks Junos OS and Junos OS Evolved allows an attacker to send a BGP update message with an AS PATH containing a large number of 4-byte ASes, leading to a Denial of Service (DoS). Continued receipt and processing of these BGP updates will create a sustained Denial of Service (DoS) condition.<br /> <br /> This issue is hit when the router has Non-Stop Routing (NSR) enabled, has a non-4-byte-AS capable BGP neighbor, receives a BGP update message with a prefix that includes a long AS PATH containing large number of 4-byte ASes, and has to advertise the prefix towards the non-4-byte-AS capable BGP neighbor.<br /> <br /> Note: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.<br /> This issue affects:<br /> <br /> Juniper Networks Junos OS:<br /> <br /> <br /> <br /> * All versions prior to 20.4R3-S8;<br /> * 21.1 versions 21.1R1 and later;<br /> * 21.2 versions prior to 21.2R3-S6;<br /> * 21.3 versions prior to 21.3R3-S5;<br /> * 21.4 versions prior to 21.4R3-S5;<br /> * 22.1 versions prior to 22.1R3-S4;<br /> * 22.2 versions prior to 22.2R3-S2;<br /> * 22.3 versions prior to 22.3R2-S2, 22.3R3-S1;<br /> * 22.4 versions prior to 22.4R2-S1, 22.4R3.<br /> <br /> <br /> <br /> <br /> Juniper Networks Junos OS Evolved<br /> <br /> <br /> <br /> * All versions prior to 20.4R3-S8-EVO;<br /> * 21.1 versions 21.1R1-EVO and later;<br /> * 21.2 versions prior to 21.2R3-S6-EVO;<br /> * 21.3 versions prior to 21.3R3-S5-EVO;<br /> * 21.4 versions prior to 21.4R3-S5-EVO;<br /> * 22.1 versions prior to 22.1R3-S4-EVO;<br /> * 22.2 versions prior to 22.2R3-S2-EVO;<br /> * 22.3 versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO;<br /> * 22.4 versions prior to 22.4R2-S1-EVO, 22.4R3-EVO.<br /> <br /> <br /> <br /> <br /> <br /> <br />