Affects Juniper Junos — core routing OS used widely; a remote eBGP peer can crash the routing daemon causing network outages.
CVE-2026-101961
eBGP-crafted BGP packet triggers NULL-deref in Junos nexthop-ECMP, causing routing-daemon DoS.
Is CVE-2026-101961 being exploited?
Not confirmed. CVE-2026-101961 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 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-101961?
CVE-2026-101961 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-2026-101961?
Yes. A fix has been recorded for CVE-2026-101961. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-101961 affect?
CVE-2026-101961 affects Juniper Junos OS, Junos OS Evolved, Juniper routers running affected Junos. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-101961?
Apply Juniper patch ASAP; restrict eBGP peers and remove nexthop-ecmp qualifiers until fixed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote Denial of Service: a configured eBGP peer can crash the routing daemon via a crafted BGP packet when nexthop-ecmp is used, causing routing outages.
Immediate action required
- 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>= 23.4 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.