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CVE-2026-33799

Junos OS and Junos OS Evolved: Receipt of a specific SNMPv3 request results in memory leak and eventual snmpd crash

5.3 Medium

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 31st percentile. No source names a fixed version.

What does this mean?
Severity
5.3 MediumCVSS 4.0, CVE List
Exploit chance
0.37%EPSS, 31st percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
No fix listedNo source names one

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.

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

0.37%Unchanged since Jul 10, 2026
90%50%10%1%

Affected products

What each source reports

CVE List Score used5.3

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 MediumCVSS: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 MediumCVSS: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-2026-427005.3

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 MediumCVSS: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-rwrm5.3

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 MediumCVSS: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 MediumCVSS: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
NVD5.3

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 MediumCVSS: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 MediumCVSS: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

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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