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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.

PUBLISHED Reserved 2026-03-23 | Published 2026-04-09 | Updated 2026-04-10 | Assigner juniper




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

HIGH: 8.7CVSS: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

Problem types

CWE-1286 Improper Validation of Syntactic Correctness of Input

Product status

Default status
unaffected

Any version before 22.4R3-S9
affected

23.2 (semver) before 23.2R2-S6
affected

23.4 (semver) before 23.4R2-S7
affected

24.2 (semver) before 24.2R2-S4
affected

24.4 (semver) before 24.4R2-S3
affected

25.2 (semver) before 25.2R1-S2, 25.2R2
affected

References

kb.juniper.net/JSA107868 vendor-advisory

cve.org (CVE-2026-33778)

nvd.nist.gov (CVE-2026-33778)

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