Full Report
Juniper Networks security advisory (AV26-675)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Juniper Networks Products (July 2026 Quarterly Update)
## CVE Details
- **CVE ID:** CVE-2020-7450, CVE-2026-33799 (and others associated with CTPView/Junos Space)
- **CVSS Score:** Varies; CVE-2026-33799 is rated **7.5 (High)**; CVE-2020-7450 is rated **7.1 (High)**
- **CWE:** CWE-122 (Heap-based Buffer Overflow), CWE-401 (Missing Release of Memory after Effective Lifetime)
## Affected Systems
- **Products:**
- Junos OS and Junos OS Evolved
- Junos Space
- CTPView
- Juniper cRPD
- Juniper Network Director
- Junos OS on MX Series (with SPC3) and SRX Series
- **Versions:**
- **CVE-2020-7450:** All versions of Junos OS Evolved.
- **CVE-2026-33799:** Multiple versions of Junos OS and all versions of Junos OS Evolved.
- **Network Director:** Versions prior to 7.1R3.
- **Junos Space:** All versions prior to 26.1R1 Patch V1.
- **CTPView:** All versions prior to 9.3R2-3.
- **Configurations:** Systems running SNMPv3 (for CVE-2026-33799) or performing URL handling via libfetch.
## Vulnerability Description
This advisory covers two primary highlighted flaws alongside general product updates:
1. **CVE-2020-7450 (Heap Buffer Overflow):** A vulnerability in the `libfetch` library used by Junos OS Evolved for URL handling. Processing a maliciously crafted URL can trigger a heap-based buffer overflow, potentially leading to arbitrary code execution or a system crash.
2. **CVE-2026-33799 (Memory Leak):** A flaw in the SNMP daemon (`snmpd`) where receipt of a specific, specially crafted SNMPv3 request causes a memory leak. Repeated exploitation leads to memory exhaustion and the eventual crash of the `snmpd` process, resulting in a Denial of Service (DoS).
## Exploitation
- **Status:** No reports of exploitation in the wild for the 2026 CVE; CVE-2020-7450 is a known library flaw. No public PoC currently cited for the specific Juniper implementations.
- **Complexity:** Low (for DoS via SNMP); Medium (for Buffer Overflow).
- **Attack Vector:** Network.
## Impact
- **Confidentiality:** Low to High (depending on code execution success).
- **Integrity:** Low to High.
- **Availability:** High (Critical services like `snmpd` or the OS itself can be rendered unavailable).
## Remediation
### Patches
Juniper Networks has released the following updates to address these issues:
- **Junos OS / OS Evolved:** Upgrade to versions identified in the specific security bulletins (e.g., releases following the July 2026 cycle).
- **Junos Space:** 26.1R1 Patch V1 or later.
- **CTPView:** 9.3R2-3 or later.
- **Network Director:** 7.1R3 or later.
### Workarounds
- **For SNMP (CVE-2026-33799):** Disable SNMPv3 if not required, or implement Firewall Filters (ACLs) to restrict SNMP access only to trusted management hosts.
- **For libfetch (CVE-2020-7450):** Avoid using commands that trigger URL fetching from untrusted sources until the system is patched.
## Detection
- **Indicators of Compromise:** Monitor for unexpected restarts of the `snmpd` process or "Out of Memory" (OOM) errors in system logs.
- **Detection methods:** Audit SNMP traffic for high volumes of malformed requests from unauthorized IP addresses. Use `show system processes` to monitor memory consumption of the SNMP daemon.
## References
- Juniper Advisory (Junos OS/Evolved SNMP): hxxps://supportportal[.]juniper[.]net/s/article/2026-07-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Receipt-of-a-specific-SNMPv3-request-results-in-memory-leak-and-eventual-snmpd-crash-CVE-2026-33799
- Juniper Advisory (Junos OS Evolved libfetch): hxxps://supportportal[.]juniper[.]net/s/article/2026-07-Security-Bulletin-Junos-OS-Evolved-URL-handling-vulnerability-in-libfetch-results-in-heap-buffer-overflow-CVE-2020-7450
- Canadian Centre for Cyber Security: hxxps://www[.]cyber[.]gc[.]ca/en/alerts-advisories/juniper-networks-security-advisory-av26-675