CVE-2020-1626 Junos OS Evolved: Denial of Service vulnerability in processing high rate of specific packets
An attacker can cause a sustained Denial of Service on Juniper Junos OS Evolved devices by flooding them with specific packets, crashing the packet forwarding process.
- 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-2020-1626?
CVE-2020-1626 is a high-severity denial of service vulnerability in Juniper Junos Os Evolved, published on 8 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in Juniper Networks Junos OS Evolved may allow an attacker to cause a Denial of Service (DoS) by sending a high rate of specific packets to the device, resulting in a pfemand process crash. The pfemand process is responsible for packet forwarding on the device. By continuously sending the packet flood, an attacker can repeatedly crash the pfemand process causing a sustained Denial of Service. This issue can only be triggered by traffic sent to the device. Transit traffic does not cause this issue. This issue affects all version of Junos OS Evolved prior to 19.1R1-EVO.
Which versions are affected by CVE-2020-1626?
It affects 1 product.
Products include Juniper Junos Os Evolved.
How do I fix CVE-2020-1626?
No fix has been published for CVE-2020-1626 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-2020-1626 being exploited?
There is no known exploitation of CVE-2020-1626 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos Os Evolved
- CVE-2026-21902 Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
- CVE-2023-28983 Junos OS Evolved: Shell Injection vulnerability in the gNOI server
- CVE-2025-21599 Denial of service in Junos OS Evolved
- CVE-2024-47502 Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS
- CVE-2024-39531 Junos OS Evolved: ACX 7000 Series: Protocol specific DDoS configuration affects other protocols
Sources
Also known as GHSA-5pv5-vwqw-425f.