Junos OS: Reachable Assertion in rpd allows denial of service via BGP-LS
Summary
A reachable assertion in the rpd process of Junos OS and Junos OS Evolved can be triggered by a configured BGP-LS peer that sends a BGP-LS update. An attacker can cause a denial of service of the routing control plane. The issue only applies when BGP-LS traffic engineering is configured. Juniper SIRT is not aware of malicious exploitation.
Affected
- Junos OS: before 23.2R2-S7.7; 23.4 before 23.4R2-S8.13; 24.2 before 24.2R2-S5.5; 24.4 before 24.4R2-S5; 25.2 before 25.2R2-S2; 25.4 before 25.4R1-S3; 26.2 before 26.2R1-S2
- Junos OS Evolved: before 23.2R2-S7.7-EVO; 23.4 before 23.4R2-S8.11-EVO; 24.2 before 24.2R2-S5.6-EVO; 24.4 before 24.4R2-S5-EVO; 25.2 before 25.2R2-S2-EVO; 25.4 before 25.4R1-S3-EVO; 26.2 before 26.2R1-S2-EVO; plus 23.4X100, 25.2X100 before 25.2X100-D35-EVO and 25.4X300 before 25.4X300-D40-EVO
- Only configurations with protocols bgp family traffic-engineering unicast are affected
Fixed in
- Junos OS: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1 and later
- Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 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 later
- Respins exist for 23.2, 23.4 and 24.2 releases; re-check the advisory for the correct build
Workaround
- The CVE record states there are no known workarounds.
- A mirrored record also suggests disabling BGP-LS traffic engineering or removing the BGP-LS peer if the feature is not required. This statement conflicts with the official data and may affect services. Confirm with Juniper before applying.
Exploitation
- Juniper SIRT is not aware of any malicious exploitation.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- NVD status: awaiting analysis.
Our recommendation
- Check whether Junos OS or Junos OS Evolved devices use BGP-LS traffic engineering with configured BGP-LS peers.
- Update affected devices to a fixed release listed in advisory JSA112187; verify the exact versions there first.
- Until patched, restrict BGP-LS peers to trusted sources and monitor rpd for restarts or crashes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Juniper Security Advisory JSA112187 supportportal.juniper.net
- OpenCVE: CVE-2026-102044 app.opencve.io
- Vulners VulnRichment: CVE-2026-102044 vulners.com
- Strix AI: CVE-2026-102044 www.strix.ai
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, 03:16.
Original description (NVD)
A Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved allows a configured BGP-LS peer to cause a denial of service via a BGP-LS update.
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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