Out-of-bounds write in Junos OS and Junos OS Evolved - CVE-2026-33799
Published: July 8, 2026
Vulnerability identifier: #VU137150
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33799
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Junos OS
Junos OS Evolved
Junos OS
Junos OS Evolved
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds write in the SNMP daemon (snmpd) when processing specific valid SNMPv3 queries. A remote attacker can send specific valid SNMPv3 queries to cause a denial of service.
SNMPv3 must be configured for exploitation. Continuous receipt of the queries can exhaust snmpd process memory, leading to a crash and restart and impacting SNMP-based monitoring.
How to mitigate CVE-2026-33799
Install security update from vendor's website.