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CVE-2025-21600

Junos OS and Junos OS Evolved: With certain BGP options enabled, receipt of specifically malformed BGP update causes RPD crash

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 21.4R3-S9, 22.2R3-S5, 22.3R3-S4, 22.4R3-S5, 23.2R2-S3, and 7 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

An Out-of-Bounds Read vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects systems configured in either of two ways: • systems with BGP traceoptions enabled • systems with BGP family traffic-engineering (BGP-LS) configured and can be exploited from a directly connected and configured BGP peer.  This issue affects iBGP and eBGP with any address family configured, and both IPv4 and IPv6 are affected by this vulnerability. This issue affects: Junos OS:  • from 21.4 before 21.4R3-S9,  • from 22.2 before 22.2R3-S5,  • from 22.3 before 22.3R3-S4,  • from 22.4 before 22.4R3-S5,  • from 23.2 before 23.2R2-S3,  • from 23.4 before 23.4R2-S3,  • from 24.2 before 24.2R1-S2, 24.2R2;  Junos OS Evolved:  • from 21.4-EVO before 21.4R3-S9-EVO,  • from 22.2-EVO before 22.2R3-S5-EVO,  • from 22.3-EVO before 22.3R3-S4-EVO,  • from 22.4-EVO before 22.4R3-S5-EVO,  • from 23.2-EVO before 23.2R2-S3-EVO,  • from 23.4-EVO before 23.4R2-S2-EVO,  • from 24.2-EVO before 24.2R1-S2-EVO, 24.2R2-EVO. This issue does not affect versions of Junos OS prior to 21.3R1. This issue does not affect versions of Junos OS Evolved prior to 21.3R1-EVO. This is a similar, but different vulnerability than the issue reported as CVE-2024-39516.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Juniper Networks Junos OS

    From 21.4 · fixed in 21.4R3-S9; From 22.2 · fixed in 22.2R3-S5; From 22.3 · fixed in 22.3R3-S4; From 22.4 · fixed in 22.4R3-S5; From 23.2 · fixed in 23.2R2-S3; From 23.4 · fixed in 23.4R2-S3

  • Juniper Networks Junos OS Evolved

    From 21.4-EVO · fixed in 21.4R3-S9-EVO; From 22.2-EVO · fixed in 22.2R3-S5-EVO; From 22.3-EVO · fixed in 22.3R3-S4-EVO; From 22.4-EVO · fixed in 22.4R3-S5-EVO; From 23.2-EVO · fixed in 23.2R2-S3-EVO; From 23.4-EVO · fixed in 23.4R2-S2-EVO

References 1

supportportal.juniper.net