Targets Juniper MX Series core routers; unauthenticated network DoS can cause widespread network outages for ISPs and enterprises.
CVE-2026-102046
Unauthenticated SCTP traffic triggers infinite-loop DoS in Juniper MX routers
Is CVE-2026-102046 being exploited?
Not confirmed. CVE-2026-102046 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 0.48% probability of exploitation in the next 30 days.
How severe is CVE-2026-102046?
CVE-2026-102046 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-2026-102046?
Yes. A fix has been recorded for CVE-2026-102046. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-102046 affect?
CVE-2026-102046 affects Juniper Junos OS, MX Series routers, netsctp.ko (SCTP network stack). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-102046?
Apply Juniper advisory patch immediately; block or filter SCTP at network edge as mitigation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote Denial of Service via crafted SCTP packets causing infinite loop in netsctp.ko, leading to router hang/restarts and traffic disruption.
Immediate action required
- affected< 23.2R2-S7.7
- affected>= 23.4 and < 23.4R2-S8.13
- affected>= 24.2 and < 24.2R2-S5.5
- affected>= 24.4 and < 24.4R2-S5
- affected>= 25.2 and < 25.2R2-S2
- affected>= 25.4 and < 25.4R1-S3
- affected>= 26.2 and < 26.2R1-S2
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.