Quick answers
- Is CVE-2026-102055 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102055 being exploited in the wild.
- How severe is CVE-2026-102055?
- High severity, with a CVSS score of 8.8, published 14 October 2026.
- Which products and versions are affected?
- Juniper Networks Junos OS MX Series platforms (versions prior to fix); Juniper Networks Junos OS Evolved PTX Series platforms (versions prior to fix).
- Is there a fix for CVE-2026-102055?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-102055 attacked?
- It is attacked from the adjacent network, in an operating system.
- Am I affected by CVE-2026-102055?
- Check whether you run Juniper Networks Junos OS or Juniper Networks Junos OS Evolved at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stack-based buffer overflow in the cfmd process is triggered when a specially crafted CFM Message is sent to a configured down-MEP (Maintenance Endpoint) with enhanced CFM mode enabled. The vulnerability requires adjacent network access and a specific CFM configuration, allowing an unauthenticated attacker to achieve code execution as root or denial of service.
Affected products
- Juniper Networks Junos OS MX Series platforms (versions prior to fix)
- Juniper Networks Junos OS Evolved PTX Series platforms (versions prior to fix)
Timeline
- 2026-10-14: disclosed