Affects Juniper Junos routing daemon (widely deployed network infrastructure); remote unauthenticated DoS can disrupt enterprise routing and networks.
CVE-2026-101943
Juniper rpd BGP EVPN parsing bug enables remote network-based DoS.
Is CVE-2026-101943 being exploited?
Not confirmed. CVE-2026-101943 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 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-101943?
CVE-2026-101943 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-2026-101943?
Yes. A fix has been recorded for CVE-2026-101943. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-101943 affect?
CVE-2026-101943 affects Juniper Junos OS, Juniper Junos OS Evolved, rpd (routing daemon), Juniper routers/switches running affected Junos. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-101943?
Install Juniper advisory updates ASAP; restrict/monitor EVPN BGP peers and rate-limit BGP updates.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can send crafted BGP EVPN update to crash rpd, causing routing outages and network disruption.
Patch when possible
- 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
- affected< 23.2R2-S7.7-EVO
- affected>= 23.4 and < 23.4R2-S8.11-EVO
- affected>= 24.2 and < 24.2R2-S5.6-EVO
- affected>= 24.4 and < 24.4R2-S5-EVO
- 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.