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CVE-2026-33778— Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is received kmd/iked crashes

CVSS 7.5 · High EPSS 0.14% · P33
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I. Basic Information for CVE-2026-33778

Vulnerability Information
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Vulnerability Title
Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is received kmd/iked crashes
Source: NVD (National Vulnerability Database)
Vulnerability Description
An Improper Validation of Syntactic Correctness of Input vulnerability in the IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS). If an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections. This issue affects Junos OS on SRX Series and MX Series: * all versions before 22.4R3-S9, * 23.2 version before 23.2R2-S6, * 23.4 version before 23.4R2-S7, * 24.2 versions before 24.2R2-S4, * 24.4 versions before 24.4R2-S3, * 25.2 versions before 25.2R1-S2, 25.2R2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1286
Source: NVD (National Vulnerability Database)
Vulnerability Title
Juniper Networks Junos OS SRX和Juniper Networks Junos OS MX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS SRX和Juniper Networks Junos OS MX都是美国瞻博网络（Juniper Networks）公司的产品。Juniper Networks Junos OS SRX是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是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 Netwo
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-S9 -

II. Public POCs for CVE-2026-33778

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III. Intelligence Information for CVE-2026-33778

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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-2026-337717.4 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-2026-337806.5 MEDIUMJunos OS and Junos OS Evolved: In an EVPN-MPLS scenario churn of ESI routes causes a memor
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
CVE-2026-337816.5 MEDIUMJunos OS: EX Series, QFX Series: In a VXLAN scenario when specific control protocol packet
CVE-2026-337826.5 MEDIUMJunos OS: MX Series: In specific DHCPv6 scenarios jdhcpd memory increases continuously wit
CVE-2026-337756.5 MEDIUMJunos OS: MX Series: Mismatch between configured and received packet types causes memory l
CVE-2026-337796.5 MEDIUMJunos OS: SRX Series: Insufficient certificate verification for device to SD cloud communi
CVE-2026-337836.5 MEDIUMJunos OS Evolved: PTX Series: If SRTE tunnels provisioned via PCEP are present and specifi
CVE-2026-337746.5 MEDIUMJunos OS: MX Series: Firewall filters on lo0.<non-0> in the default routing instance are n

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-1286

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