Unauthenticated remote root command execution in Juniper Junos J-Web — affects widely deployed network infrastructure; high-impact, organization-wide risk.
CVE-2026-101956
Unauthenticated remote root command execution via Juniper J-Web.
Is CVE-2026-101956 being exploited?
Not confirmed. CVE-2026-101956 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 0.75% probability of exploitation in the next 30 days.
How severe is CVE-2026-101956?
CVE-2026-101956 is rated Critical with a CVSS score of 9.3. 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-2026-101956?
Yes. A fix has been recorded for CVE-2026-101956. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-101956 affect?
CVE-2026-101956 affects Juniper Junos OS (J-Web web management), Juniper devices with J-Web enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-101956?
Apply Juniper advisory patches or disable/block J-Web access immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can execute arbitrary Junos commands as root via the J-Web web interface, full device compromise and network disruption.
Immediate action required
- 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.