CVE-2021-0216: Junos OS: ACX5448, ACX710: BFD sessions might flap due to high rate of transit ARP packets
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]: BFDDSTATEUPTODOWN: 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]: BFDDTRAPSHOPSTATEDOWN: local discriminator: 17, new state: down, interface: irb.998, peer addr: 192.168.14.3 rpd[15839]: RPDISISADJDOWN: IS-IS lost L2 adjacency to peer on irb.998, reason: BFD Session Down bfdd[15864]: BFDDTRAPSHOPSTATEUP: 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.
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Frequently Asked Questions
What is the severity of CVE-2021-0216?
CVE-2021-0216 is classified as a high severity vulnerability due to its potential to cause Denial of Service (DoS) in affected devices.
How do I fix CVE-2021-0216?
To fix CVE-2021-0216, you should upgrade your Junos OS to a patched version as recommended by Juniper Networks.
Which devices are affected by CVE-2021-0216?
CVE-2021-0216 affects Juniper Networks Junos OS running on ACX5448 and ACX710 platforms.
What impact does CVE-2021-0216 have on network stability?
CVE-2021-0216 can cause BFD sessions to flap, potentially disrupting routing protocols and leading to network instability.
Is CVE-2021-0216 publicly known or is it a zero-day vulnerability?
CVE-2021-0216 is a publicly disclosed vulnerability, which means it is not a zero-day but still poses risks to users who have not applied fixes.