CVE-2026-102063: CWE-617 Reachable Assertion in Juniper Networks Junos OS
Description
A Reachable Assertion vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos on MX Series routers allows an unauthenticated network attacker to cause a denial of service via an eBGP route update when HFRR link protection is configured in a VRF.
CVSS v3.1
Score 6.5medium
Affected software
Juniper Networks
Junos OS
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-102063) affects the routing protocol daemon (rpd) component of Juniper Networks Junos OS running on MX Series routers. Specifically, when HFRR link protection is configured in a VRF, an unauthenticated attacker can send a crafted eBGP route update that triggers a reachable assertion failure, resulting in a denial of service condition. The vulnerability is identified as CWE-617 (Reachable Assertion). The affected versions span multiple release trains prior to certain patch levels, indicating multiple fixed versions across different Junos OS releases.
Potential Impact
An unauthenticated remote attacker can cause a denial of service on affected MX Series routers by sending a malicious eBGP route update. This disrupts routing protocol operations and potentially impacts network availability. There is no impact on confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official patch or workaround information is provided in the available data. Users should monitor Juniper Networks advisories for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-09-28T17:35:40.523Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfaf322cdf04f65694d346
Added to database: 10/14/2026, 16:34:58 UTC
Last enriched: 10/14/2026, 16:49:54 UTC
Last updated: 10/15/2026, 00:48:24 UTC
Views: 8
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