Junos OS: Reachable assertion in routing daemon via BGP-LS
Summary
A reachable assertion in the routing protocol daemon (rpd) of Junos OS and Junos OS Evolved can be triggered by an attacker with access to a configured BGP-LS peer. Crafted BGP-LS Link NLRI advertisements crash the rpd. The issue occurs when BGP-LS traffic engineering is enabled. The impact is denial of service; the CNA vector shows no confidentiality or integrity impact.
Affected
- Junos OS: 24.4 to before 24.4R2-S5; 25.2 to before 25.2R2-S2; 25.4 to before 25.4R1-S3; 26.2 to before 26.2R1-S2 (default configuration unaffected)
- Junos OS Evolved: 24.4 to before 24.4R2-S5-EVO; 25.2 to before 25.2R2-S2-EVO; 25.4 to before 25.4R1-S3-EVO; 26.2 to before 26.2R1-S2-EVO; 25.2X100 to before 25.2X100-D35-EVO; 25.4X300 to before 25.4X300-D40-EVO
- Releases before 24.4 are not listed in the CNA record: Unknown.
- Required configuration: protocols bgp family traffic-engineering unicast
Fixed in
- Junos OS: 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1 and all subsequent releases
- Junos OS Evolved: 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO and all subsequent releases
- Verify the fixed release for your platform in JSA112187.
Workaround
There are no known workarounds for this issue.
Exploitation
- Juniper SIRT is not aware of any malicious exploitation.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- No public proof of concept found in the sources reviewed.
Our recommendation
- Check whether BGP-LS traffic engineering is configured (protocols bgp family traffic-engineering unicast).
- If it is not needed, disable it.
- If it is needed, restrict BGP-LS sessions to known, trusted peers.
- Patch affected devices to a fixed release in the next maintenance window, using the table in JSA112187.
- Monitor rpd crashes and BGP-LS session resets.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Juniper Security Advisory JSA112187 supportportal.juniper.net
- VulnCheck/Vulners enrichment for CVE-2026-102022 vulners.com
- OpenCVE entry for CVE-2026-102022 app.opencve.io
- CVE mirror (CNA data) for CVE-2026-102022 cve.threatint.com
- Juniper documentation: Link-state distribution using BGP www.juniper.net
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 03:21.
Original description (NVD)
A Reachable Assertion vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an attacker with access to a configured BGP-LS peer to cause an rpd crash via a crafted BGP-LS Link NLRI advertisements.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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