CVE-2026-33799
Junos OS and Junos OS Evolved: Receipt of a specific SNMPv3 request results in memory leak and eventual snmpd crash
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Junos OS and Junos OS Evolved: Receipt of a specific SNMPv3 request results in memory leak and eventual snmpd crash
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.
- Record
CVE-2026-33799- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:A/V:C/RE:M/U:Green - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2026-42700
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.
- Record
EUVD-2026-42700- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:A/V:C/RE:M/U:Green - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-x7c3-q65h-rwrm
An Out-of-bounds Write vulnerability in the SNMP daemon (snmpd) of Juniper Networks Junos OS and...
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.
- Record
GHSA-x7c3-q65h-rwrm- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:Green - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-33799- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:Green - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-787
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-33799 is a medium vulnerability (CVSS 5.3) in Juniper Junos, published July 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 30th percentile. No source names a fixed version.