CVE-2026-101977 Junos OS and Junos OS Evolved: A specific BGP packet causes an rpd crash when ephemeral configuration is used
A configured eBGP peer can crash the routing daemon via a specific BGP packet when ephemeral configuration is enabled, causing denial of service.
- 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-2026-101977?
CVE-2026-101977 is a high-severity vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a configured eBGP peer to cause a persistent routing-daemon denial of service via a specific BGP packet when ephemeral configuration is used.
Weakness: CWE-476
Which versions are affected by CVE-2026-101977?
How do I fix CVE-2026-101977?
No fix has been published for CVE-2026-101977 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-101977 being exploited?
There is no known exploitation of CVE-2026-101977 in the wild and no public exploit code.
Sources
Also known as GHSA-6mqg-fmqw-35c3.