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🛡️ CVE-2026-33799 — junos

🟡 CVSS 4.3 — Medium ✅ No Known Exploit CWE-787 NVD
4.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

An Out-of-bounds Write vulnerability in the SNMP daemon (snmpd) of Juniper Networks Junos OS and Junos OS Evolved allows an authenticated network-based attacker sending specific valid SNMPv3 queries to trigger a memory leak. Over time, continuous receipt of these queries will result in snmpd process memory exhaustion, resulting in a process crash and restart, impacting the ability to monitor the system via SNMP.

Memory usage can be monitored using the following command:

user@device> show system processes extensive | match snmpd

This issue affects:

Junos OS:

  • all versions before 21.2R3-S8;
  • from 21.4 before 21.4R3-S7;
  • from 22.1 before 22.1R3-S6;
  • from 22.2 before 22.2R3-S4;
  • from 22.3 before 22.3R3-S3;
  • from 22.4 before 22.4R3-S2;
  • from 23.2 before 23.2R2;
  • from 23.4 before 23.4R2.

Junos OS Evolved:

  • all versions before 21.2R3-S8-EVO;
  • from 21.4 before 21.4R3-S7-EVO;
  • all versions of 22.1-EVO,
  • from 22.2 before 22.2R3-S4-EVO;
  • from 22.3 before 22.3R3-S3-EVO;
  • all versions of 22.4-EVO,
  • from 23.2 before 23.2R2-EVO;
  • from 23.4 before 23.4R2-EVO.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2026-33799 is classified as CWE-787: Out-of-bounds Write. Data is written past the end or before the start of a buffer, corrupting whatever is stored there.

Affected software

CVE-2026-33799 is recorded against 2 packages.

  • junos
  • junos-os-evolved

Timeline and source

Published on 9 July 2026 and last revised on 13 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

supportportal.juniper.net

Other advisories for this package

junos has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-787: Out-of-bounds Write) in other software:

Details

Severity MEDIUM
CVSS Score 4.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE CWE-787
Public Exploit ✅ No
Source NVD
Published 2026-07-09
Updated 2026-08-20
Modified 2026-07-13
Fix URL N/A

Affected Packages

Software From version Fixed in
junos — —
junos-os-evolved — —

References

Mitigation, Vendor Advisory https://supportportal.juniper.net/JSA110074

Similar Threats

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