CVE-2024-47507: BGP update message containing aggregator attribute with an ASN value of zero (0) is accepted

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-S6 or later
Junos OS 22.2	22.2R3-S3 or later
Junos OS 22.4	22.4R3 or later
Junos OS Evolved 0	21.4R3-S7-EVO or later
Junos OS Evolved 22.2	22.2R3-S4-EVO or later
Junos OS Evolved 22.4	22.4R3-EVO or later

Always confirm against the vendor advisory, which lists every fixed hotfix.

What it is

An Improper Check for Unusual or Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause an integrity impact to the downstream devices.

When a peer sends a BGP update message which contains the aggregator attribute with an ASN value of zero (0), rpd accepts and propagates this attribute, which can cause issues for downstream BGP peers receiving this.

This issue affects:

Junos OS:

All versions before 21.4R3-S6,
22.2 versions before 22.2R3-S3,
22.4 versions before 22.4R3;

Junos OS Evolved:

All versions before 21.4R3-S7-EVO,
22.2 versions before 22.2R3-S4-EVO,
22.4 versions before 22.4R3-EVO.

Am I affected?

To be exposed to this issue a minimal BGP configuration like the following is required:

[ protocols bgp group <name> neighbor ... ]

Workarounds

There are no known workarounds for this issue.

Exploitation

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.