Junos OS: MX Series: Dynamic filter fails to match IPv6 prefix

Summary

When the "Intrusion Detection Service" (IDS) feature is configured on Juniper Networks MX series with a dynamic firewall filter using IPv6 source or destination prefix, it may incorrectly match the prefix as /32, causing the filter to block unexpected traffic. This issue affects only IPv6 prefixes when used as source and destination. This issue affects MX Series devices using MS-MPC, MS-MIC or MS-SPC3 service cards with IDS service configured. This issue affects: Juniper Networks Junos OS 17.3 versions prior to 17.3R3-S10 on MX Series; 17.4 versions prior to 17.4R3-S3 on MX Series; 18.1 versions prior to 18.1R3-S11 on MX Series; 18.2 versions prior to 18.2R3-S6 on MX Series; 18.3 versions prior to 18.3R3-S4 on MX Series; 18.4 versions prior to 18.4R3-S6 on MX Series; 19.1 versions prior to 19.1R2-S2, 19.1R3-S3 on MX Series; 19.2 versions prior to 19.2R3-S1 on MX Series; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1 on MX Series; 19.4 versions prior to 19.4R3 on MX Series; 20.1 versions prior to 20.1R2 on MX Series; 20.2 versions prior to 20.2R2 on MX Series;

Timeline

1. Jan 15, 2021, 5:35 PM UTCCVE published
2. Sep 16, 2024, 5:28 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  From 17.3 · fixed in 17.3R3-S10; From 17.4 · fixed in 17.4R3-S3; From 18.1 · fixed in 18.1R3-S11; From 18.2 · fixed in 18.2R3-S6; From 18.3 · fixed in 18.3R3-S4; From 18.4 · fixed in 18.4R3-S6; From 19.2 · fixed in 19.2R3-S1; From 19.4 · fixed in 19.4R3; From 20.1 · fixed in 20.1R2; From 20.2 · fixed in 20.2R2

References 1