CVE-2026-102063 Junos OS: MX Series: An unauthenticated network attacker causes an rpd crash when HFRR link protection is used
An unauthenticated attacker can crash the routing daemon on MX Series routers by sending a specific eBGP update when HFRR link protection is enabled.
- 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-2026-102063?
CVE-2026-102063 is a high-severity denial of service vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Reachable Assertion vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos on MX Series routers allows an unauthenticated network attacker to cause a denial of service via an eBGP route update when HFRR link protection is configured in a VRF.
Weakness: CWE-617
Which versions are affected by CVE-2026-102063?
How do I fix CVE-2026-102063?
No fix has been published for CVE-2026-102063 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-102063 being exploited?
There is no known exploitation of CVE-2026-102063 in the wild and no public exploit code.
Sources
Also known as GHSA-xp4x-7pfr-9746.