CVE-2023-28979 Junos OS: In a 6PE scenario upon receipt of a specific IPv6 packet an integrity check fails

Medium 4.7 Published 17 Apr 2023 Updated 26 Feb 2025

An adjacent attacker can bypass integrity checks in Junos OS 6PE scenarios, allowing malformed IPv6 packets to be forwarded to connected networks.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-28979?

CVE-2023-28979 is a medium-severity vulnerability in Juniper Junos, published on 17 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the kernel of Juniper Networks Junos OS allows an adjacent unauthenticated attacker to bypass an integrity check. In a 6PE scenario and if an additional integrity check is configured, it will fail to drop specific malformed IPv6 packets, and then these packets will be forwarded to other connected networks. This issue affects Juniper Networks Junos OS: All versions prior to 19.3R3-S7; 19.4 versions prior to 19.4R3-S9; 20.2 versions prior to 20.2R3-S7; 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S4; 21.1 versions prior to 21.1R3-S3; 21.2 versions prior to 21.2R3-S2; 21.3 versions prior to 21.3R3-S1; 21.4 versions prior to 21.4R2-S1, 21.4R3; 22.1 versions prior to 22.1R2; 22.2 versions prior to 22.2R2.

Weakness: CWE-754

Which versions are affected by CVE-2023-28979?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2023-28979?

No fix has been published for CVE-2023-28979 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-28979 being exploited?

There is no known exploitation of CVE-2023-28979 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-6p7r-3f3w-fj8c.