NVD

CVE-2026-33778 Detail

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: Juniper Networks, Inc.

CVSS-B 8.7 HIGH

Vector: 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/AU:Y/RE:M

CVSS 3.x Severity and Vector Strings:

CNA: Juniper Networks, Inc.

Base Score: 7.5 HIGH

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://kb.juniper.net/JSA107868	Juniper Networks, Inc.	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1286	Improper Validation of Syntactic Correctness of Input	Juniper Networks, Inc.

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Change History

2 change records found show changes

Initial Analysis by NIST 4/17/2026 1:23:59 PM

Action

Type

Old Value

New Value

Added

CPE Configuration

Record truncated, showing 2048 of 4723 characters.
View Entire Change Record

AND
     OR
          *cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r3-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r3-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r3-s3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r3-s4:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r3-s5:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2-s3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* versions up to (excluding) 22.4
          *cpe:2.3:o:juniper:junos:22.4:r3-s6:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r3-s7:*:*:*:*:*:*
          *cpe:2.3:o:jun

Added

Reference Type

Juniper Networks, Inc.: https://kb.juniper.net/JSA107868 Types: Vendor Advisory

New CVE Received from Juniper Networks, Inc. 4/09/2026 6:16:26 PM

Action	Type	New Value
Added	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.
Added	CVSS V4.0	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
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added	CWE	CWE-1286
Added	Reference	https://kb.juniper.net/JSA107868

Quick Info

CVE Dictionary Entry:
CVE-2026-33778
NVD Published Date:
04/09/2026
NVD Last Modified:
04/17/2026
Source:
Juniper Networks, Inc.

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National Vulnerability Database