CVE-2026-33796: CWE-121 Stack-based Buffer Overflow in Juniper Networks Junos OS
Description
CVE-2026-33796 is a critical stack-based buffer overflow vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved. It allows a configured external BGP neighbor to execute arbitrary commands with root privileges via BMP route monitoring. The vulnerability affects multiple versions of Junos OS and Junos OS Evolved prior to specific fixed releases. The CVSS score is 9.8, indicating a high severity with network attack vector, no privileges required, and no user interaction needed. There are no known exploits in the wild at this time.
CVSS v3.1
Score 9.8critical
Affected software
Juniper Networks
Junos OS
Juniper Networks
Junos OS Evolved
pkg:rpm/juniper/junos-ospkg:rpm/juniper/junos-os-evoRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-33796) is a stack-based buffer overflow in the routing protocol daemon (rpd) component of Juniper Networks Junos OS and Junos OS Evolved. It specifically involves the BMP (BGP Monitoring Protocol) route monitoring feature, where a configured external BGP neighbor can exploit the overflow to execute arbitrary commands with root privileges. The vulnerability is critical (CVSS 9.8) due to its potential for full system compromise without authentication or user interaction. Multiple affected version ranges are identified, covering various Junos OS and Junos OS Evolved releases prior to fixed versions. No public exploits are currently known.
Potential Impact
Successful exploitation allows an external BGP neighbor to execute arbitrary commands with root privileges on the affected device. This can lead to complete system compromise, including confidentiality, integrity, and availability impacts. The vulnerability is remotely exploitable without authentication or user interaction, making it highly dangerous in exposed network environments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until official patches or updates are available, restrict or disable BMP route monitoring from untrusted external BGP neighbors to mitigate risk. Monitor vendor communications closely for release of official fixes.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-03-23T19:46:13.673Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfb9f02cdf04f6569934a8
Added to database: 10/14/2026, 17:20:48 UTC
Last enriched: 10/14/2026, 17:33:20 UTC
Last updated: 10/14/2026, 17:36:07 UTC
Views: 3
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