Threats Tagged 'cve-2026-21909'
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Threats Tagged 'cve-2026-21909'
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0 CVE-2026-21909 is a medium-severity vulnerability in Juniper Networks Junos OS and Junos OS Evolved affecting versions 23.2, 23.4, and 24.1 before certain patches. It involves a missing release of memory after its effective lifetime in the routing protocol daemon (rpd), specifically triggered by an unauthenticated attacker controlling an adjacent IS-IS neighbor sending crafted update packets. This causes a memory leak that can exhaust system memory, leading to a crash of the rpd process and a denial of service (DoS). No confidentiality or integrity impact is reported, and exploitation does not require authentication or user interaction but does require adjacency in the IS-IS network. Monitoring memory usage via 'show task memory detail' can help detect exploitation attempts. No known exploits are currently in the wild. European organizations relying on Juniper routing infrastructure with IS-IS enabled are at risk, especially in countries with critical network infrastructure and high Juniper market penetration. Join the discussion | CVE Database V5 | 01/15/2026, 20:22:44 UTC Added: 01/15/2026, 20:30:47 UTC |
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