Junos OS (SRX firewalls)
CVE-2026-33797: An attacker sending a specific genuine BGP packet causes a BGP reset
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).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Junos OS 25.2 | 25.2R2 or later |
| Junos OS 0 | Not affected |
| Junos OS Evolved 25.2 | 25.2R2-EVO or later |
| Junos OS Evolved 0 | Not affected |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Am I affected?
[ protocols bgp group <group> neighbor ]
Workarounds
There are no known workarounds for this issue.
Exploitation
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.