CVE-2026-33794
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
A vulnerability in the advanced forwarding toolkit (evo-aftmand) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated network-based attacker to generate continuous routing updates, causing the evo-aftmand process on the PFE to crash, leading to a Denial-of-Service (DoS). Successful exploitation depends on a sequence of events outside the attacker's direct control.
Risk Assessment
The risk is that an attacker can trigger a crash of the evo-aftmand process, disrupting routing and packet forwarding services, requiring manual recovery via system or FPC reboot. This can result in significant network downtime and service unavailability.
Recommendation
It is recommended to immediately upgrade Junos OS Evolved to version 24.4R2-S3-EVO or 25.2R2-EVO, which contain the fix. If upgrade is not possible, consider limiting the scope of routing updates or applying temporary filtering rules.
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)
An Improper Check for Unusual or Exceptional Conditions vulnerability in the advanced forwarding toolkit (evo-aftmand) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated network-based attacker generating continuous routing updates, resulting in unilist ECMP routes, to crash the evo-aftmand process on the PFE, leading to a Denial-of-Service (DoS). The conditions required for successful exploitation are based on a sequence of events that are outside an attacker's direct control. Unified list (unilist) ECMP routes are a specific ECMP behavior where multiple equal-cost routes share a single logical next-hop list entry. The router treats them as one route with multiple next hops and load balances traffic across that unified list. Due to an issue processing unilist ECMP routing updates, internal state corruption may occur, especially in large-scale ECMP unilist deployments, leading to the evo-aftmand process crashing, resulting in an evo-aftmand-bx core. Manual intervention is required to recover by rebooting the system or restarting the FPC. This issue affects Junos OS Evolved on PTX : * from 24.4R2-EVO before 24.4R2-S3-EVO; * from 25.2 before 25.2R2-EVO.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS