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Vulnerability details

CVE-2026-33797

Juniper Networks Junos OSJuniper Networks Junos OS Evolved

Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a BGP reset

CVSS 4.0
7.1High

Official 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.

CVSS scores

ScoreVersionSourceVector
7.1High 4.0 CVEProject cvelistV5 (CNA) (juniper) CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Green
7.4High 3.1 CVEProject cvelistV5 (CNA) (juniper) CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

VendorProductVersionsSource
Juniper Networks Junos OS 25.2 ≤ v < 25.2R2 CVEProject cvelistV5 (CNA)
Juniper Networks Junos OS Evolved 25.2 ≤ v < 25.2R2-EVO CVEProject cvelistV5 (CNA)

References and advisories

2
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Details

Published
2026-04-10
Last updated
2026-04-23
State
Published
Assigner (CNA)
juniper

Exploit prediction (EPSS)

0.17%
Probability of exploitation in 30 days
6.9%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-20
    Improper Input Validation