Junos OS and Junos OS Evolved: NULL pointer dereference in rpd causes denial of service
Summary
A NULL pointer dereference in the routing protocol daemon (rpd) of Junos OS and Junos OS Evolved can crash the daemon and interrupt routing. An unauthenticated attacker who is a configured MSDP peer or an adjacent PIM sender can trigger it when an MSDP or PIM policy uses AS-path expansion. The CVSS 4.0 score is 8.7 (High), and the impact is limited to availability.
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, 23.4X100, 25.2X100 before 25.2X100-D35-EVO, 25.4X300 before 25.4X300-D40-EVO
- Required configuration: a policy with as-path-expand used by MSDP or PIM, and BGP export policy in protocols bgp (per CNA record)
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
- Fix status of 23.4X100 (Evolved): Unknown. Check the Juniper advisory.
Workaround
- No known workarounds according to the CNA record.
Exploitation
- Juniper SIRT is not aware of any malicious exploitation.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- No public proof of concept or KEV listing found.
Our recommendation
- Check whether Junos devices in your environment run multicast routing with MSDP or PIM, and whether as-path-expand policies are used.
- If so, plan the upgrade to a fixed release, ideally together with the other fixes in JSA112187.
- Restrict MSDP and PIM sessions to known and trusted peers.
- Confirm affected and fixed versions in the Juniper advisory before making changes.
- If neither protocol is used, no specific action is needed beyond routine patching.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Juniper Security Advisory JSA112187 supportportal.juniper.net
- VulnCheck VulnRichment CVE-2026-102029 vulners.com
- OpenCVE CVE-2026-102029 app.opencve.io
- Strix CVE-2026-102029 (secondary version data) www.strix.ai
- ThreatInt CVE-2026-102029 (secondary version data) cve.threatint.com
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, 03:18.
Original description (NVD)
A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated configured MSDP peer or adjacent PIM sender to cause a denial of service via an MSDP or PIM policy that uses AS-path expansion.
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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