Junos OS (SRX firewalls)
CVE-2025-52953: An unauthenticated adjacent attacker sending a valid BGP UPDATE packet forces a BGP session reset
An Expected Behavior Violation vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a valid BGP UPDATE packet to cause a BGP session reset, resulting in 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 0 | 21.2R3-S9 or later |
| Junos OS 21.4 | 21.4R3-S11 or later |
| Junos OS 22.2 | 22.2R3-S7 or later |
| Junos OS 22.4 | 22.4R3-S7 or later |
| Junos OS 23.2 | 23.2R2-S4 or later |
| Junos OS 23.4 | 23.4R2-S4 or later |
| Junos OS 24.2 | 24.2R2 or later |
| Junos OS 24.4 | 24.4R1-S3, 24.4R2 or later |
| Junos OS Evolved 0 | 22.2R3-S7-EVO or later |
| Junos OS Evolved 22.4-EVO | 22.4R3-S7-EVO or later |
| Junos OS Evolved 23.2-EVO | 23.2R2-S4-EVO or later |
| Junos OS Evolved 23.4-EVO | 23.4R2-S4-EVO or later |
| Junos OS Evolved 24.2-EVO | 24.2R2-EVO or later |
| Junos OS Evolved 24.4-EVO | 24.4R1-S3-EVO, 24.4R2-EVO or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Expected Behavior Violation vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a valid BGP UPDATE packet to cause a BGP session reset, resulting in a Denial of Service (DoS).
Continuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
This issue affects iBGP and eBGP and both IPv4 and IPv6 are affected by this vulnerability.
This issue affects Junos OS:
- All versions before 21.2R3-S9,
- from 21.4 before 21.4R3-S11,
- from 22.2 before 22.2R3-S7,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S4,
- from 23.4 before 23.4R2-S4,
- from 24.2 before 24.2R2,
- from 24.4 before 24.4R1-S3, 24.4R2
Junos OS Evolved:
- All versions before 22.2R3-S7-EVO,
- from 22.4-EVO before 22.4R3-S7-EVO,
- from 23.2-EVO before 23.2R2-S4-EVO,
- from 23.4-EVO before 23.4R2-S4-EVO,
- from 24.2-EVO before 24.2R2-EVO,
- from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.
Am I affected?
One of the following minimal configurations is necessary to be exposed to this issue: [protocols bgp group <group-name> neighbor <peer-ip-address> family inet6-vpn unicast] or [protocols bgp group <group-name> family inet6-vpn unicast] or [protocols bgp family inet6-vpn unicast]
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.