Juniper Junos is core routing software used by enterprises and ISPs; an unauthenticated BGP-induced rpd crash can cause widespread network outages and service disruption.
CVE-2026-101948
Remote BGP FlowSpec update triggers rpd NULL-pointer DoS in Juniper Junos.
Is CVE-2026-101948 being exploited?
Not confirmed. CVE-2026-101948 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.
How severe is CVE-2026-101948?
CVE-2026-101948 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-2026-101948?
Not known from our data. No patch reference has been recorded for CVE-2026-101948, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-101948 affect?
CVE-2026-101948 affects Juniper Junos OS, Junos OS Evolved, routing protocol daemon (rpd), Affected BGP sessions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-101948?
Apply Juniper advisory/patch ASAP; block or filter untrusted BGP peers and FlowSpec updates.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated BGP peer can crash rpd via crafted FlowSpec, causing routing service outage 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
- affected>= 25.2 and < 25.2R2-S2-EVO
- affected>= 25.4 and < 25.4R1-S3-EVO
- affected>= 26.2 and < 26.2R1-S2-EVO
- affected23.4X100
- affected>= 25.2X100 and < 25.2X100-D35-EVO
- affected>= 25.4X300 and < 25.4X300-D40-EVO
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.