CVE-2021-31370

Summary

An Incomplete List of Disallowed Inputs vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on QFX5000 Series and EX4600 Series allows an adjacent unauthenticated attacker which sends a high rate of specific multicast traffic to cause control traffic received from the network to be dropped. This will impact control protocols (including but not limited to routing-protocols) and lead to a Denial of Service (DoS). Continued receipt of this specific multicast traffic will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on QFX5000 and EX4600 Series: All versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4, 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S2, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2.

Affected Software

Weaknesses

• CWE-184: CWE-184: Incomplete List of Disallowed Inputs
• Denial of Service (DoS)

Workarounds

Please ensure you have a loopback filter applied to drop unneeded multicast traffic.

You can find further information on such filters in https://www.rfc-editor.org/rfc/rfc6192 and in "Hardening Junos Devices, 2nd Edition" at https://www.juniper.net/documentation/jnbooks/us/en/day-one-books

ADP Enrichment

CVE Program Container

Additional References

• https://kb.juniper.net/JSA11232

References

• https://kb.juniper.net/JSA11232

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