Juniper Networks has disclosed a big vulnerability affecting its Junos OS and Junos OS Advanced platforms.
Recognized as CVE-2025-21598, this flaw permits unauthenticated distant attackers to use a important out-of-bounds learn vulnerability within the routing protocol daemon (rpd).
The vulnerability is triggered when gadgets are configured with Border Gateway Protocol (BGP) choices enabled, resulting in potential crashes and broader community disruptions.
Overview of the Vulnerability
The affected variations of Junos OS embrace 21.2R3-S8, 21.4R3-S7, 22.2R3-S4, 22.3R3-S2, 22.4R3, 23.2R2, 23.4R1, and 24.2R1, in addition to the corresponding variations of Junos OS Advanced.
The vulnerability has been assigned a excessive severity rating of seven.5 underneath the CVSS v3.1—indicating a important threat that might result in severe ramifications for community integrity.
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The core situation arises from the power of attackers to ship malformed BGP packets to gadgets enabled with particular packet hint choices.
This malfunction could cause the rpd to crash, interrupting BGP classes and doubtlessly spreading the problem throughout Autonomous Programs (ASes). Each Inner BGP (iBGP) and Exterior BGP (eBGP) are affected, risking the steadiness of IPv4 and IPv6 networks alike.
In keeping with the Juniper report, Community directors are suggested to observe their programs for indicators of this vulnerability. An indicator of compromise may be detecting malformed replace messages from neighboring ASes.
Related log messages could embrace alerts about acquired malformed updates and malformed attributes, which point out that the problem is propagating.
To handle the vulnerability, Juniper Networks has launched up to date software program variations that treatment the problem.
Customers are inspired to improve to the next patched variations: for Junos OS, 21.2R3-S9, 21.4R3-S9, 22.2R3-S5, 22.3R3-S4, 22.4R3-S5, 23.2R2-S2, 23.4R2-S1, 24.2R1-S1, 24.2R2, and subsequent releases.
Equally, for Junos OS Advanced, customers ought to improve to variations 21.4R3-S9-EVO, 22.2R3-S5-EVO, 22.3R3-S4-EVO, 22.4R3-S5-EVO, 23.2R2-S2-EVO, 23.4R2-S1-EVO, 24.2R1-S2-EVO, 24.2R2-EVO, and all subsequent releases.
For speedy threat mitigation whereas awaiting updates, disabling the BGP packet tracing choices is really useful as a workaround.
The emergence of CVE-2025-21598 serves as a reminder for organizations to usually patch their networking gear and stay vigilant in opposition to vulnerabilities that may very well be exploited for distant community assaults.
Juniper Networks’ immediate disclosure and provision of options underscore the significance of proactive cybersecurity measures in sustaining community integrity.
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