First published: Wed Apr 14 2021(Updated: )
A vulnerability in Juniper Networks Junos OS running on the ACX5448 and ACX710 platforms may cause BFD sessions to flap when a high rate of transit ARP packets are received. This, in turn, may impact routing protocols and network stability, leading to a Denial of Service (DoS) condition. When a high rate of transit ARP packets are exceptioned to the CPU and BFD flaps, the following log messages may be seen: bfdd[15864]: BFDD_STATE_UP_TO_DOWN: BFD Session 192.168.14.3 (IFL 232) state Up -> Down LD/RD(17/19) Up time:11:38:17 Local diag: CtlExpire Remote diag: None Reason: Detect Timer Expiry. bfdd[15864]: BFDD_TRAP_SHOP_STATE_DOWN: local discriminator: 17, new state: down, interface: irb.998, peer addr: 192.168.14.3 rpd[15839]: RPD_ISIS_ADJDOWN: IS-IS lost L2 adjacency to peer on irb.998, reason: BFD Session Down bfdd[15864]: BFDD_TRAP_SHOP_STATE_UP: local discriminator: 17, new state: up, interface: irb.998, peer addr: 192.168.14.3 This issue only affects the ACX5448 Series and ACX710 Series routers. No other products or platforms are affected by this vulnerability. This issue affects Juniper Networks Junos OS: 18.2 versions prior to 18.2R3-S8 on ACX5448; 18.3 versions prior to 18.3R3-S5 on ACX5448; 18.4 versions prior to 18.4R1-S6, 18.4R3-S7 on ACX5448; 19.1 versions prior to 19.1R3-S5 on ACX5448; 19.2 versions prior to 19.2R2, 19.2R3 on ACX5448; 19.3 versions prior to 19.3R3 on ACX5448; 19.4 versions prior to 19.4R3 on ACX5448; 20.1 versions prior to 20.1R2 on ACX5448; 20.2 versions prior to 20.2R2 on ACX5448 and ACX710.
Credit: sirt@juniper.net
Affected Software | Affected Version | How to fix |
---|---|---|
Juniper JUNOS | =20.2-r1 | |
Juniper JUNOS | =20.2-r1-s1 | |
Juniper JUNOS | =20.2-r1-s2 | |
Juniper Acx5448 | ||
Juniper Acx710 | ||
Juniper JUNOS | =18.2 | |
Juniper JUNOS | =18.2-r1 | |
Juniper JUNOS | =18.2-r1 | |
Juniper JUNOS | =18.2-r1-s2 | |
Juniper JUNOS | =18.2-r1-s3 | |
Juniper JUNOS | =18.2-r1-s4 | |
Juniper JUNOS | =18.2-r1-s5 | |
Juniper JUNOS | =18.2-r2 | |
Juniper JUNOS | =18.2-r2-s1 | |
Juniper JUNOS | =18.2-r2-s2 | |
Juniper JUNOS | =18.2-r2-s3 | |
Juniper JUNOS | =18.2-r2-s4 | |
Juniper JUNOS | =18.2-r2-s5 | |
Juniper JUNOS | =18.2-r2-s6 | |
Juniper JUNOS | =18.2-r2-s7 | |
Juniper JUNOS | =18.2-r3 | |
Juniper JUNOS | =18.2-r3-s1 | |
Juniper JUNOS | =18.2-r3-s2 | |
Juniper JUNOS | =18.2-r3-s3 | |
Juniper JUNOS | =18.2-r3-s4 | |
Juniper JUNOS | =18.2-r3-s5 | |
Juniper JUNOS | =18.2-r3-s6 | |
Juniper JUNOS | =18.2-r3-s7 | |
Juniper JUNOS | =18.3 | |
Juniper JUNOS | =18.3-r1 | |
Juniper JUNOS | =18.3-r1-s1 | |
Juniper JUNOS | =18.3-r1-s2 | |
Juniper JUNOS | =18.3-r1-s3 | |
Juniper JUNOS | =18.3-r1-s4 | |
Juniper JUNOS | =18.3-r1-s5 | |
Juniper JUNOS | =18.3-r1-s6 | |
Juniper JUNOS | =18.3-r2 | |
Juniper JUNOS | =18.3-r2-s1 | |
Juniper JUNOS | =18.3-r2-s2 | |
Juniper JUNOS | =18.3-r2-s3 | |
Juniper JUNOS | =18.3-r2-s4 | |
Juniper JUNOS | =18.3-r3 | |
Juniper JUNOS | =18.3-r3-s1 | |
Juniper JUNOS | =18.3-r3-s2 | |
Juniper JUNOS | =18.3-r3-s3 | |
Juniper JUNOS | =18.3-r3-s4 | |
Juniper JUNOS | =18.4 | |
Juniper JUNOS | =18.4-r1 | |
Juniper JUNOS | =18.4-r1-s1 | |
Juniper JUNOS | =18.4-r1-s2 | |
Juniper JUNOS | =18.4-r1-s3 | |
Juniper JUNOS | =18.4-r1-s4 | |
Juniper JUNOS | =18.4-r1-s5 | |
Juniper JUNOS | =18.4-r3 | |
Juniper JUNOS | =18.4-r3-s1 | |
Juniper JUNOS | =18.4-r3-s2 | |
Juniper JUNOS | =18.4-r3-s3 | |
Juniper JUNOS | =18.4-r3-s4 | |
Juniper JUNOS | =18.4-r3-s5 | |
Juniper JUNOS | =18.4-r3-s6 | |
Juniper JUNOS | =19.1 | |
Juniper JUNOS | =19.1-r1 | |
Juniper JUNOS | =19.1-r1-s1 | |
Juniper JUNOS | =19.1-r1-s2 | |
Juniper JUNOS | =19.1-r1-s3 | |
Juniper JUNOS | =19.1-r1-s4 | |
Juniper JUNOS | =19.1-r1-s5 | |
Juniper JUNOS | =19.1-r2 | |
Juniper JUNOS | =19.1-r2-s1 | |
Juniper JUNOS | =19.1-r3 | |
Juniper JUNOS | =19.1-r3-s1 | |
Juniper JUNOS | =19.1-r3-s2 | |
Juniper JUNOS | =19.1-r3-s3 | |
Juniper JUNOS | =19.1-r3-s4 | |
Juniper JUNOS | =19.2 | |
Juniper JUNOS | =19.2-r1 | |
Juniper JUNOS | =19.2-r1-s1 | |
Juniper JUNOS | =19.2-r1-s2 | |
Juniper JUNOS | =19.2-r1-s3 | |
Juniper JUNOS | =19.2-r1-s4 | |
Juniper JUNOS | =19.2-r1-s5 | |
Juniper JUNOS | =19.3 | |
Juniper JUNOS | =19.3-r1 | |
Juniper JUNOS | =19.3-r1-s1 | |
Juniper JUNOS | =19.3-r2 | |
Juniper JUNOS | =19.3-r2-s1 | |
Juniper JUNOS | =19.3-r2-s2 | |
Juniper JUNOS | =19.3-r2-s3 | |
Juniper JUNOS | =19.3-r2-s4 | |
Juniper JUNOS | =19.3-r2-s5 | |
Juniper JUNOS | =19.4-r1 | |
Juniper JUNOS | =19.4-r1-s1 | |
Juniper JUNOS | =19.4-r1-s2 | |
Juniper JUNOS | =19.4-r2 | |
Juniper JUNOS | =19.4-r2-s1 | |
Juniper JUNOS | =19.4-r2-s2 | |
Juniper JUNOS | =20.1-r1 | |
Juniper JUNOS | =20.1-r1-s1 | |
Juniper JUNOS | =20.1-r1-s2 | |
Juniper JUNOS | =20.1-r1-s3 | |
Juniper JUNOS | =20.1-r1-s4 |
The following software releases have been updated to resolve this specific issue: Junos OS 18.2R3-S8, 18.3R3-S5, 18.4R1-S6, 18.4R3-S7, 19.1R3-S5, 19.2R2, 19.2R3, 19.3R3, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases.
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