Full Report
Juniper Networks security advisory (AV26-1043)
Analysis Summary
# Vulnerability: Juniper Networks Junos OS and Junos OS Evolved Multiple Vulnerabilities
## CVE Details
- **CVE ID:** CVE-2026-XXXXX (Multiple vulnerabilities covered under advisory AV26-1043)
- **CVSS Score:** Cumulative Critical/High (Specific scores vary by individual flaw within the bulletin)
- **CWE:** Not explicitly listed in summary; typically involves Improper Input Validation or Resource Management.
## Affected Systems
- **Products:** Junos OS and Junos OS Evolved
- **Versions:**
- **Junos OS:**
- Versions prior to 23.2R2-S7.7
- 23.4 prior to 23.4R2-S8.13
- 24.2 prior to 24.2R2-S5.5
- 24.4 prior to 24.4R2-S5
- 25.2 prior to 25.2R2-S2
- 25.4 prior to 25.4R1-S3
- 26.2 prior to 26.2R1-S2
- **Junos OS Evolved:**
- Versions prior to 23.2R2-S7.7-EVO
- 23.4 prior to 23.4R2-S8.11-EVO
- 24.2 prior to 24.2R2-S5.6-EVO
- 24.4 prior to 24.4R2-S5-EVO
- 25.2 prior to 25.2R2-S2-EVO
- 25.4 prior to 25.4R1-S3-EVO
- 26.2 prior to 26.2R1-S2-EVO
- 23.4X100-EVO (All)
- 25.2X100 prior to 25.2X100-D35-EVO
- 25.4X300 prior to 25.4X300-D40-EVO
- **Configurations:** Systems running affected versions of Junos OS/OS Evolved routing and switching platforms.
## Vulnerability Description
This advisory addresses multiple security vulnerabilities within the core operating systems of Juniper devices. These flaws typically involve issues in the processing of network traffic or management interface requests which could lead to Denial of Service (DoS), unauthorized access, or remote code execution.
## Exploitation
- **Status:** Not exploited (No reports of active exploitation at time of release)
- **Complexity:** Medium (Dependent on specific service configuration)
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** Moderate to High
- **Integrity:** Moderate to High
- **Availability:** High (Risk of system crash or service disruption)
## Remediation
### Patches
Juniper Networks has released the following updated software versions to address these flaws:
- **Junos OS:** 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 26.2R1-S2.
- **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, 25.4R1-S3-EVO, 26.2R1-S2-EVO, 25.2X100-D35-EVO, 25.4X300-D40-EVO.
### Workarounds
- Limit access to management interfaces (J-Web, SSH) to trusted hosts only.
- Disable unused services and protocols.
- Implement robust firewall filters (ACLs) to protect the Control Plane.
## Detection
- **Indicators of Compromise:** Monitor system logs for unexpected reboots, core dumps, or unauthorized configuration changes.
- **Detection methods and tools:** Utilize Juniper’s built-in logging and telemetry; perform regular vulnerability scans against management interfaces.
## References
- **Vendor Advisory:** hxxps://supportportal[.]juniper[.]net/s/article/2026-10-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Multiple-vulnerabilities-resolved
- **Cyber Centre Bulletin:** hxxps://www[.]cyber[.]gc[.]ca/en/alerts-advisories/juniper-networks-security-advisory-av26-1043