CVE-2026-33778

April 9, 2026, 10:16 p.m.

8.7
High

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.

Product(s) Impacted

Vendor Product Versions
Juniper
  • Junos Os
  • <22.4R3-S9, 23.2, 23.4, 24.2, 24.4, 25.2

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-1286
Improper Validation of Syntactic Correctness of Input
The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a juniper junos_os <22.4R3-S9 / / / / / / /
a juniper junos_os 23.2 <23.2R2-S6 / / / / / /
a juniper junos_os 23.4 <23.4R2-S7 / / / / / /
a juniper junos_os 24.2 <24.2R2-S4 / / / / / /
a juniper junos_os 24.4 <24.4R2-S3 / / / / / /
a juniper junos_os 25.2 <25.2R1-S2,25.2R2 / / / / / /

References

https://kb.juniper.net/JSA107868

Tags

[email protected]
CWE-1286
2026-04-09
CVE-2026-33778

CVSS Score

8.7 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: NONE
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: HIGH
  • Exploit Maturity: NOT_DEFINED

    • 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

    View Vector String

Timeline

Published: April 9, 2026, 10:16 p.m.
Last Modified: April 9, 2026, 10:16 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.