Junos OS (SRX firewalls)
CVE-2025-52949: In an EVPN environment, receipt of specifically malformed BGP update causes RPD crash
An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, 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 | 21.4R3-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-S5 or later |
| Junos OS 24.2 | 24.2R2-S1 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-S5-EVO or later |
| Junos OS Evolved 24.2-EVO | 24.2R2-S1-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 Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
Only systems configured for Ethernet Virtual Private Networking (EVPN) signaling are vulnerable to this issue.
This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects:
Junos OS:
- all versions before 21.4R3-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-S5,
- from 24.2 before 24.2R2-S1,
- 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-S5-EVO,
- from 24.2-EVO before 24.2R2-S1-EVO,
- from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.
Am I affected?
This issue only affects systems configured for EVPN signaling. For example:
[protocols bgp family evpn signaling]
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.