Skip to main content

Juniper CVE-2026-33782

| EUVDEUVD-2026-21091 HIGH
Memory Leak (CWE-401)
2026-04-09 juniper GHSA-rpvg-7w65-9g7p
Juniper Denial Of Service
8.7
CVSS 4.0 · NVD
Share

Severity by source

NVD PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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:X/V:X/RE:M/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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:X/V:X/RE:M/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

7
Re-analysis Queued
Apr 17, 2026 - 17:52 vuln.today
cvss_changed
Analysis Updated
Apr 16, 2026 - 05:59 EUVD-patch-fix
executive_summary
Re-analysis Queued
Apr 16, 2026 - 05:29 backfill_euvd_patch
patch_released
Patch available
Apr 16, 2026 - 05:29 EUVD
23.2R2,22.4R3-S1,23.4R2
EUVD ID Assigned
Apr 09, 2026 - 21:45 euvd
EUVD-2026-21091
Analysis Generated
Apr 09, 2026 - 21:45 vuln.today
CVE Published
Apr 09, 2026 - 21:29 nvd
HIGH 8.7

DescriptionCVE.org

A Missing Release of Memory after Effective Lifetime vulnerability in the DHCP daemon (jdhcpd) of Juniper Networks Junos OS on MX Series, allows an adjacent, unauthenticated attacker to cause a memory leak, that will eventually cause a complete Denial-of-Service (DoS).

In a DHCPv6 over PPPoE, or DHCPv6 over VLAN with Active lease query or Bulk lease query scenario, every subscriber logout will leak a small amount of memory. When all available memory has been exhausted, jdhcpd will crash and restart which causes a complete service impact until the process has recovered.

The memory usage of jdhcpd can be monitored with:

user@host> show system processes extensive | match jdhcpd

This issue affects Junos OS:

  • all versions before 22.4R3-S1,
  • 23.2 versions before 23.2R2,
  • 23.4 versions before 23.4R2.

AnalysisAI

Memory leak in Juniper Networks Junos OS jdhcpd daemon enables adjacent unauthenticated attackers to crash DHCP services on MX Series routers. Each DHCPv6 subscriber logout in PPPoE or VLAN configurations with active/bulk lease query leaks memory, eventually exhausting resources and triggering jdhcpd crash. Service remains unavailable until process restart completes. Affects all Junos OS versions before 22.4R3-S1, 23.2 versions before 23.2R2, and 23.4 versions before 23.4R2. No public exploit identified at time of analysis.

Technical ContextAI

CWE-401 memory management flaw in jdhcpd process handling DHCPv6 lease query operations. Memory allocation during subscriber session teardown lacks proper deallocation, creating persistent leaks proportional to logout events. Cumulative exhaustion forces daemon termination rather than graceful degradation.

RemediationAI

Vendor-released patches available: upgrade to Junos OS 22.4R3-S1, 23.2R2, or 23.4R2 depending on current deployment branch. Workarounds for unpatched systems include disabling DHCPv6 active lease query and bulk lease query features if operationally feasible, though this reduces DHCP functionality. Monitor jdhcpd memory consumption using 'show system processes extensive | match jdhcpd' to detect leak progression and schedule maintenance before exhaustion occurs. Official vendor advisory with complete mitigation details: https://kb.juniper.net/JSA107820

More in Juniper

View all
CVE-2015-7755 CRITICAL POC
9.8 Dec 19

Juniper ScreenOS 6.2.0r15 through 6.2.0r18, 6.3.0r12 before 6.3.0r12b, 6.3.0r13 before 6.3.0r13b, 6.3.0r14 before 6.3.0r
CVE-2025-21590 MEDIUM
6.7 Mar 12

A security vulnerability in An Improper (CVSS 6.7) that allows a local attacker with high privileges. Risk factors: acti
CVE-2023-36845 CRITICAL POC
9.8 Aug 17

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series and SRX Series all
CVE-2013-6618 CRITICAL POC
9.0 Nov 05

jsdm/ajax/port.php in J-Web in Juniper Junos before 10.4R13, 11.4 before 11.4R7, 12.1 before 12.1R5, 12.2 before 12.2R3,
CVE-2017-10622 CRITICAL
9.8 Oct 13

An authentication bypass vulnerability in Juniper Networks Junos Space Network Management Platform may allow a remote un
CVE-2018-20193 HIGH POC
8.8 Dec 21

Certain Secure Access SA Series SSL VPN products (originally developed by Juniper Networks but now sold and supported by
CVE-2014-6380 HIGH POC
7.8 Oct 14

Juniper Junos 11.4 before R11, 12.1 before R9, 12.1X44 before D30, 12.1X45 before D20, 12.1X46 before D15, 12.1X47 befor
CVE-2021-0253 HIGH POC
7.8 Apr 22

NFX Series devices using Juniper Networks Junos OS are susceptible to a local command execution vulnerability thereby al
CVE-2021-0252 HIGH POC
7.8 Apr 22

NFX Series devices using Juniper Networks Junos OS are susceptible to a local code execution vulnerability thereby allow
CVE-2019-0053 HIGH POC
7.8 Jul 11

Insufficient validation of environment variables in the telnet client supplied in Junos OS can lead to stack-based buffe
CVE-2023-22415 HIGH POC
7.5 Jan 13

An Out-of-Bounds Write vulnerability in the H.323 ALG of Juniper Networks Junos OS allows an unauthenticated, network-ba
CVE-2022-22223 HIGH POC
7.5 Oct 18

On QFX10000 Series devices using Juniper Networks Junos OS when configured as transit IP/MPLS penultimate hop popping (P

Same weakness CWE-401 – Memory Leak

View all
CVE-2016-4232 HIGH POC
7.5
CVE-2024-25450 HIGH POC
8.8
CVE-2023-33718 HIGH POC
8.8
CVE-2019-6128 HIGH POC
8.8
CVE-2023-34451 HIGH POC
8.2
CVE-2023-41484 HIGH POC
8.1
CVE-2023-23145 HIGH POC
7.8
CVE-2022-35858 HIGH POC
7.8

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

Share

CVE-2026-33782 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy