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CVE-2026-33782— Junos OS: MX Series: In specific DHCPv6 scenarios jdhcpd memory increases continuously with subscriber logouts

CVSS 6.5 · Medium EPSS 0.05% · P15
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I. Basic Information for CVE-2026-33782

Vulnerability Information
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Vulnerability Title
Junos OS: MX Series: In specific DHCPv6 scenarios jdhcpd memory increases continuously with subscriber logouts
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Juniper Networks Junos OS MX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS MX是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS MX 22.4R3-S1之前版本、23.2R2之前版本和23.4R2之前版本存在安全漏洞，该漏洞源于jdhcpd存在内存释放问题，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Juniper NetworksJunos OS 0 ~ 22.4R3-S1 -

II. Public POCs for CVE-2026-33782

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III. Intelligence Information for CVE-2026-33782

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Same Patch Batch · Juniper Networks · 2026-04-09 · 26 CVEs total

CVE-2026-337849.8 CRITICALJSI Virtual Lightweight Collector: Default password is not required to be changed which al
CVE-2026-337858.8 HIGHJunos OS: MX Series: Missing Authorization for specific 'request' CLI commands in a JDM/CS
CVE-2025-139148.7 HIGHApstra: SSH host key validation vulnerability for managed devices
CVE-2026-337937.8 HIGHJunos OS and Junos OS Evolved: When an unsigned Python op script configuration is present,
CVE-2026-337887.8 HIGHJunos OS Evolved: Local, authenticated attacker can gain privileged access to FPCs
CVE-2026-337907.5 HIGHJunos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 pa
CVE-2026-337787.5 HIGHJunos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is rece
CVE-2026-337717.4 HIGHCTP OS: Configuring password requirements does not work which permits the use of weak pass
CVE-2026-337977.4 HIGHJunos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a
CVE-2026-219167.3 HIGHJunos OS: A low privileged user can escalate their privileges so that they can login as ro
CVE-2026-337916.7 MEDIUMJunos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shel
CVE-2026-219156.7 MEDIUMJSI Virtual Lightweight Collector: Shell escape allows privilege escalation to root
CVE-2026-337746.5 MEDIUMJunos OS: MX Series: Firewall filters on lo0.<non-0> in the default routing instance are n
CVE-2026-337836.5 MEDIUMJunos OS Evolved: PTX Series: If SRTE tunnels provisioned via PCEP are present and specifi
CVE-2026-337796.5 MEDIUMJunos OS: SRX Series: Insufficient certificate verification for device to SD cloud communi
CVE-2026-337756.5 MEDIUMJunos OS: MX Series: Mismatch between configured and received packet types causes memory l
CVE-2026-337806.5 MEDIUMJunos OS and Junos OS Evolved: In an EVPN-MPLS scenario churn of ESI routes causes a memor
CVE-2026-337816.5 MEDIUMJunos OS: EX Series, QFX Series: In a VXLAN scenario when specific control protocol packet
CVE-2025-599696.5 MEDIUMJunos OS Evolved: QFX5000 Series and PTX Series: An attacker sending crafted multicast pac
CVE-2026-219196.5 MEDIUMJunos OS and Junos OS Evolved: A high frequency of connecting and disconnecting NETCONF se

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-401

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