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MEDIUM · 5.9

CVE-2026-33794

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 ...

Vulnerability Description

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.

CVSS Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
JuniperJunos Os Evolved24.4
JuniperPtx1000-72Q-
JuniperPtx10000-
JuniperPtx10001-
JuniperPtx10001-36Mr-
JuniperPtx100016-
JuniperPtx10002-
JuniperPtx10002-36Qdd-
JuniperPtx10002-60C-
JuniperPtx10003-
JuniperPtx10003 160C-
JuniperPtx10003 80C-
JuniperPtx10003 81Cd-
JuniperPtx10004-
JuniperPtx10008-
JuniperPtx10016-
JuniperPtx12008-
JuniperPtx3000-
JuniperPtx5000-

Related Weaknesses (CWE)

CWE-754

References

FAQ

What is CVE-2026-33794?

CVE-2026-33794 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ...

How severe is CVE-2026-33794?

CVE-2026-33794 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33794?

Check the references section above for vendor advisories and patch information. Affected products include: Juniper Junos Os Evolved, Juniper Ptx1000-72Q, Juniper Ptx10000, Juniper Ptx10001, Juniper Ptx10001-36Mr.