CVE-2026-101976
7.5HighPublished 14 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Impact
- High impact on availability
- Weakness
- CWE-787
Impact
An adjacent or connected eBGP peer can crash the routing protocol daemon (rpd), triggering a denial-of-service on the router. The attacker only needs an established eBGP session that has not negotiated four-octet AS support to send a malformed BGP update.
Root cause
An out-of-bounds write occurs in rpd when processing specifically malformed BGP updates received from peers without 4-octet AS capability.
Affected systems
Versions not listed — check the vendor advisory.
CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Fix & remediation
Upgrade to the fixed Junos OS / Junos OS Evolved release referenced in advisory JSA112187. As an interim workaround, ensure four-octet AS capability is enforced or negotiated on all untrusted eBGP sessions, or tear down unneeded eBGP peerings.
AI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD description
An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an eBGP peer which has not negotiated four-octet-AS capability sending a specifically malformed BGP update to cause a Denial-of-Service (DoS).