CVE-2021-31372 Junos OS: J-Web allows a locally authenticated attacker to escalate their privileges to root.

High 8.8 Published 19 Oct 2021 Updated 16 Sep 2024

A locally authenticated attacker can exploit improper input validation in J-Web to escalate privileges to root on Juniper Junos OS devices.

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

What is CVE-2021-31372?

CVE-2021-31372 is a high-severity vulnerability in Juniper Junos, published on 19 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web attacker to escalate their privileges to root over the target device. This issue affects: Juniper Networks Junos OS All 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 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2, 21.1R3; 21.2 versions prior to 21.2R1-S1, 21.2R2;

Weakness: CWE-20

Which versions are affected by CVE-2021-31372?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2021-31372?

No fix has been published for CVE-2021-31372 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-31372 being exploited?

There is no known exploitation of CVE-2021-31372 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-86jj-q96q-44q7.