CVE-2021-31375 Junos OS: Receipt of a specific BGP update may cause RPKI policy-checks to be bypassed

High 7.2 Published 19 Oct 2021 Updated 17 Sep 2024

Attackers can bypass RPKI policy checks in Junos OS to accept or propagate spoofed BGP advertisements, requiring RPKI configuration.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-31375?

CVE-2021-31375 is a high-severity vulnerability in Juniper Junos, published on 19 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Improper Input Validation vulnerability in routing process daemon (RPD) of Juniper Networks Junos OS devices configured with BGP origin validation using Resource Public Key Infrastructure (RPKI), allows an attacker to send a specific BGP update which may cause RPKI policy-checks to be bypassed. This, in turn, may allow a spoofed advertisement to be accepted or propagated. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S18; 15.1 versions prior to 15.1R7-S9; 17.2 versions prior to 17.2R3-S3; 17.3 versions prior to 17.3R3-S7; 17.4 versions prior to 17.4R2-S9, 17.4R3; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S3; 18.3 versions prior to 18.3R3-S1; 18.4 versions prior to 18.4R3; 19.1 versions prior to 19.1R2; 19.2 versions prior to 19.2R2; 19.3 versions prior to 19.3R2.

Weakness: CWE-358, CWE-20

Which versions are affected by CVE-2021-31375?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2021-31375?

No fix has been published for CVE-2021-31375 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-31375 being exploited?

There is no known exploitation of CVE-2021-31375 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-5cv3-4c79-w87h.