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CVE-2026-33797

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CVE-2026-33797

Published: Apr 9, 2026

Modified: Apr 23, 2026

PUBLISHED

CVSS v3.1

7.4

HIGH

Description

An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS). An attacker repeatedly sending the packet will sustain the Denial of Service (DoS).This issue affects Junos OS: * 25.2 versions before 25.2R2 This issue does not affect Junos OS versions before 25.2R1. This issue affects Junos OS Evolved: * 25.2-EVO versions before 25.2R2-EVO This issue does not affect Junos OS Evolved versions before 25.2R1-EVO. eBGP and iBGP are affected. IPv4 and IPv6 are affected.

VendorProductVersions

Juniper Networks

Junos OS

affected
25.2 - < 25.2R2
unaffected
0 - < 25.2R1

Juniper Networks

Junos OS Evolved

affected
25.2 - < 25.2R2-EVO
unaffected
0 - < 25.2R1-EVO

Weaknesses (CWE)

CWE-20

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

References

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