Out-of-bounds Write Vulnerability in Junos OS and Junos OS Evolved
CVE-2026-33799

5.3MEDIUM

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Junos Os Evolved
Vendor
CVE Published:
9 July 2026

Badges

👾 Exploit Exists

What is CVE-2026-33799?

An Out-of-bounds Write vulnerability exists in the SNMP daemon (snmpd) of Juniper Networks' Junos OS and Junos OS Evolved. This flaw permits an authenticated network-based attacker to send specific SNMPv3 queries that can trigger a memory leak over time. As these queries are continuously received, the process memory of snmpd is gradually exhausted, leading to a crash and subsequent restart of the process. This impacts system monitoring through SNMP, creating significant availability concerns.

Affected Version(s)

Junos OS 0 < 21.2R3-S8

Junos OS 21.4 < 21.4R3-S7

Junos OS 22.1 < 22.1R3-S6

References

https://supportportal.juniper.net/JSA110074
vendor-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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