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An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker which sends a specific set of BGP communities to cause a Denial-of-Service (DoS) as rpd crashes when graceful-shutdown sender community is added when attempting to advertise.

This vulnerability is an out-of-bounds write (CWE-787) in the routing protocol daemon (rpd) component of Juniper Networks Junos OS and Junos OS Evolved. It is triggered when an adjacent attacker sends a crafted set of BGP communities that includes the graceful-shutdown sender community during advertisement attempts. This causes the rpd process to crash, leading to a denial-of-service condition. The vulnerability affects multiple versions across several Junos OS release trains and their Evolved variants, as detailed in the affectedVersions field. The CVSS 3.1 vector indicates the attack requires adjacent network access, low attack complexity, low privileges, no user interaction, and impacts availability with no confidentiality or integrity impact.

CVE-2026-103993 is an out-of-bounds write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved. An adjacent attacker can send a specific set of BGP communities including a graceful-shutdown sender community to cause the rpd process to crash, resulting 

CVE-2026-103993: CWE-787 Out-of-bounds Write in Juniper Networks Junos OS

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