High [CVE-2026-33797] 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)
This high-severity Juniper Networks advisory covers CVE-2026-33797 affecting Junos OS, Junos OS Evolved, Junos.
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Summary
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.
eBGP and iBGP are affected. IPv4 and IPv6 are affected.
- 25.2
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 25.2R2
- 25.2R1
- 25.2R2-EVO
- 25.2R1-EVO
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 25.2R2, 25.2R1, 25.2R2-EVO, 25.2R1-EVO. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Discussion(0)
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