Junos OS (SRX firewalls)
CVE-2024-39543: Receipt of a large RPKI-RTR PDU packet can cause rpd to crash
A Buffer Copy without Checking Size of Input vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to send specific RPKI-RTR packets resulting in a crash, creating a Denial of Service (DoS) condition.
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-S8 or later |
| Junos OS 21.4 | 21.4R3-S8 or later |
| Junos OS 22.2 | 22.2R3-S4 or later |
| Junos OS 22.3 | 22.3R3-S3 or later |
| Junos OS 22.4 | 22.4R3-S2 or later |
| Junos OS 23.2 | 23.2R2-S1 or later |
| Junos OS 23.4 | 23.4R2 or later |
| Junos OS Evolved 0 | 21.2R3-S8-EVO or later |
| Junos OS Evolved 21.4 | 21.4R3-S8-EVO or later |
| Junos OS Evolved 22.2 | 22.2R3-S4-EVO or later |
| Junos OS Evolved 22.3 | 22.3R3-S3-EVO or later |
| Junos OS Evolved 22.4 | 22.4R3-S2-EVO or later |
| Junos OS Evolved 23.2 | 23.2R2-S1-EVO or later |
| Junos OS Evolved 23.4 | 23.4R2-EVO or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Buffer Copy without Checking Size of Input vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to send specific RPKI-RTR packets resulting in a crash, creating a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
This issue affects
Junos OS:
- All versions before 21.2R3-S8,
- from 21.4 before 21.4R3-S8,
- from 22.2 before 22.2R3-S4,
- from 22.3 before 22.3R3-S3,
- from 22.4 before 22.4R3-S2,
- from 23.2 before 23.2R2-S1,
- from 23.4 before 23.4R2.
Junos OS Evolved: * All versions before 21.2R3-S8-EVO, * from 21.4 before 21.4R3-S8-EVO, * from 22.2 before 22.2R3-S4-EVO, * from 22.3 before 22.3R3-S3-EVO, * from 22.4 before 22.4R3-S2-EVO, * from 23.2 before 23.2R2-S1-EVO, * from 23.4 before 23.4R2-EVO.
Am I affected?
To be affected by this issue rpki-rtr session needs to be UP with the DUT with a given IP or by way of configuration.
More information regarding the config can be found here: https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/validation-edit-routing-options.html
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.