CVE-2026-101980 Junos OS: Malformed Extended Echo requests cause a Routing Engine reboot when Extended Echo is enabled
An unauthenticated attacker can cause a kernel crash and Routing Engine reboot via malformed Extended Echo requests when this feature is enabled.
- 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-2026-101980?
CVE-2026-101980 is a critical 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
An Integer Underflow vulnerability in the kernel of Juniper Networks Junos OS with Extended Echo configured allows an unauthenticated, network-based attacker to cause a denial of service by a kernel crash.
Weakness: CWE-191
Which versions are affected by CVE-2026-101980?
How do I fix CVE-2026-101980?
No fix has been published for CVE-2026-101980 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-101980 being exploited?
There is no known exploitation of CVE-2026-101980 in the wild and no public exploit code.
Sources
Also known as GHSA-3gp7-cmr3-7prg.