Widely deployed Junos IPsec on SRX/MX; unauthenticated network DoS could disrupt enterprise VPN infrastructure.
CVE-2026-33778
Unauthenticated network DoS in Junos IPsec kmd/iked can crash service and halt VPN SAs.
Is CVE-2026-33778 being exploited?
Not confirmed. CVE-2026-33778 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-33778?
CVE-2026-33778 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33778?
Yes. A fix has been recorded for CVE-2026-33778. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33778 affect?
CVE-2026-33778 affects Juniper Networks Junos OS SRX Series, Juniper Networks Junos OS MX Series. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33778?
Upgrade to fixed Junos OS release (e.g., 22.4R3-S9 or newer)
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can crash kmd/iked via malformed ISAKMP, denying new VPN SAs and VPN connectivity.
Patch when possible
- affected< 22.4R3-S9
- affected>= 23.2 and < 23.2R2-S6
- affected>= 23.4 and < 23.4R2-S7
- affected>= 24.2 and < 24.2R2-S4
- affected>= 24.4 and < 24.4R2-S3
- affected>= 25.2 and < 25.2R1-S2, 25.2R2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.