CVE-2026-57029 Junos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand process can crash
An adjacent attacker can crash the evo-pfemand process by triggering sFlow collector reachability changes, causing a denial of service on Juniper QFX switches.
- 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-2026-57029?
CVE-2026-57029 is a medium-severity vulnerability in Juniper Junos Os Evolved, published on 9 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on QFX Series allows an adjacent, unauthenticated attacker to cause a Denial-of-Service (DoS).
When the reachability of an sFlow collector changes, the corresponding next-hop entry is updated. If this update occurs simultaneously with the sFlow thread accessing the next-hop data (which is outside the attackers control), it causes the evo-pfemand process to crash, impacting all traffic forwarding until the automatic process restart has completed.
This issue affects Junos OS Evolved on QFX Series:
* all 23.2 versions, * 23.4 versions before 23.4R2-S7-EVO, * 24.2 versions before 24.2R2-S5-EVO, * 24.4 versions before 24.4R2-S3-EVO, * 25.2 versions before 25.2R2-EVO.
Weakness: CWE-820
Which versions are affected by CVE-2026-57029?
It affects 1 product.
Products include Juniper Junos Os Evolved.
How do I fix CVE-2026-57029?
No fix has been published for CVE-2026-57029 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-57029 being exploited?
There is no known exploitation of CVE-2026-57029 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-x7gh-cpmx-x9cj.