Affects Juniper MX/PTX core routers; unauthenticated root RCE/DoS against network infrastructure — high impact across organizations and service providers.
CVE-2026-102055
Unauthenticated buffer overflow in Junos cfmd enabling root RCE or DoS
Is CVE-2026-102055 being exploited?
Not confirmed. CVE-2026-102055 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 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-102055?
CVE-2026-102055 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-2026-102055?
Not known from our data. No patch reference has been recorded for CVE-2026-102055, 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-2026-102055 affect?
CVE-2026-102055 affects Juniper Junos OS (MX Series), Juniper Junos OS Evolved (PTX Series), cfmd process, Devices with enhanced CFM and configured down‑MEP. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-102055?
Apply vendor patch ASAP; if unavailable disable enhanced CFM or restrict adjacent‑network access and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated adjacent‑network attacker can send crafted CFM to a down‑MEP (enhanced CFM) to achieve root remote code execution or crash the device (DoS).
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
- 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.