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CVE-2026-33797

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

Published: Apr 9, 2026Updated: Apr 23, 2026 Sources: CVE List NVDCWE-20
NVD MITRE
7.4CVSSHIGH
EPSS Score
0.2%
Top 93.9%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

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 Vector Breakdown

AV:AAC:LPR:NUI:NS:CC:NI:NA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-20

Affected Products

Junos OSJuniper NetworksNetworking Infrastructure
Junos OS EvolvedJuniper NetworksNetworking Infrastructure
junosjuniperNetworking Infrastructure
junos os evolvedjuniperNetworking Infrastructure
juniper networkscommercialUSNetworking Infrastructure
junipercommercialUSNetworking Infrastructureaka juniper networks, juniper networks inc.

Attack Graph

Products CVE Techniques Tactics

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Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Initial Access
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References

https://kb.juniper.net/JSA107850
kb.juniper.net
https://supportportal.juniper.net/JSA107850
supportportal.juniper.net

Timeline

Published
Apr 9, 2026
Last Updated
Apr 23, 2026

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