CVE-2026-57029
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
A missing synchronization vulnerability in the sFlow collector handler of Junos OS Evolved on QFX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS). When the reachability of an sFlow collector changes and the sFlow thread simultaneously accesses next-hop data, the evo-pfemand process crashes, blocking traffic forwarding until automatic restart.
Risk Assessment
The attack can disrupt QFX switch operations, halting all network traffic forwarding and causing significant network downtime.
Recommendation
Immediately upgrade Junos OS Evolved to version 23.4R2-S7-EVO, 24.2R2-S5-EVO, 24.4R2-S3-EVO, 25.2R2-EVO or later as per the fixed versions list.
Other vulnerabilities in Junos OS Evolved
See all- CVE-2026-101978High
An OS command injection vulnerability in the bootzd zero-touch provisioning daemon of Junos OS Evolved on PTX Series allows an unauthenticated attacker on the management LAN to execute commands as root via a crafted gRPC response.
- CVE-2026-101967High
An OS command injection vulnerability in the bootzd zero-touch provisioning daemon of Junos OS Evolved allows an unauthenticated attacker on the management LAN to execute commands as root via a crafted DHCP response.
- CVE-2026-102085Medium
An improper restriction of communication channel to intended endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause limited information disclosure and availability impact to the device. Due to wrong initialization, a process that should only communicate internally can be reached over the network via an open port, leading to inadvertent exposure and increased CPU cycles spent processing ingress packets.
- CVE-2026-102068High
A stack-based buffer overflow vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated remote attacker to trigger a kernel panic via a crafted TCP packet when key-chain authentication is used for BGP or LDP.
- CVE-2026-102045Medium
An Out-of-bounds Write vulnerability in lacpd of Juniper Networks Junos OS Evolved allows a Layer-2-adjacent attacker to cause a denial of service via a crafted frame received on an LACP-enabled aggregated-Ethernet member port.
- CVE-2026-102023High
A Reachable Assertion vulnerability in fwstatsd of Juniper Networks Junos OS Evolved allows an authenticated network attacker to cause a denial of service via an SNMP firewall-counter MIB query when at least one firewall counter is configured.
- CVE-2026-102012High
A Reachable Assertion vulnerability in the na-grpcd process of Juniper Networks Junos OS Evolved allows a remote unauthenticated attacker to cause a denial of service via a gRPC telemetry subscription request.
- CVE-2026-101985Medium
An Improper Validation of Specified Quantity in Input vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated IS-IS peer to cause a denial of service.
- CVE-2026-101966High
A use of externally-controlled format string vulnerability in the jti-dialoutd of Junos OS Evolved allows an authenticated network attacker to cause persistent telemetry dial-out denial of service via a crafted analytics sensor resource submitted through gNMI listener.
- CVE-2026-101965High
A use of externally-controlled format string vulnerability in the gRPC daemon of Junos OS Evolved allows an authenticated network attacker to cause telemetry-service disruption, information disclosure, or potential root-level code execution via a crafted message to the gNMI service.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

