CVE-2023-4481: Junos OS and Junos OS Evolved: A crafted BGP UPDATE message allows a remote attacker to de-peer (reset) BGP sessions (CVE-2023-4481)

The following software releases have been updated to resolve this specific issue: Junos OS: 20.4R3-S10, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5 or 21.4R3-S7, 22.1R3-S4, 22.2R3-S3, 22.3R3-S1, 22.4R3, 23.2R2, 23.3R2, 23.4R1, and all subsequent releases Note: except for Junos OS 21.4R3-S6 which is affected and unfixed. Junos OS Evolved: 20.4R3-S10-EVO, 21.2R3-S7-EVO, 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R3-S1-EVO, 22.4R3-EVO, 23.2R2-EVO, 23.4R1-EVO, and all subsequent releases. It is important that customers implement the workaround in addition to taking any updated software as these crafted UPDATE messages may be propagated to other devices even if non-impacted locally, thereby protecting the network by stopping the propagation of these crafted UPDATE messages. The workaround is to configure BGP error tolerance by way of:   [ protocols bgp bgp-error-tolerance ... ] Additional details can be found at https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/bgp-error-messages.h... https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/bgp-error-messages.html Juniper considers configuring this option to be a Best Common Practice (BCP) as it not only prevents this issue from happening, but protects against similar issues as well. This issue is being tracked as PR 1709837 https://prsearch.juniper.net/problemreport/PR1709837  which is visible on the Customer Support website. Note: Juniper SIRT's policy https://kb.juniper.net/KB16765  is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).