# CVE-2026-102015: Juniper Junos OS heap buffer overflow in secure-dot1xd

Source: https://junglewise.ai/threats/cve-2026-102015-a-heap-based-buffer-overflow-vulnerability-in-the-secure-dot1xd  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-102015 · Severity: high · CVSS 8.8 · Published 2026-10-14

A heap-based buffer overflow exists in the 802.1X authentication daemon (secure-dot1xd) on Juniper network switches and routers running Junos OS or Junos OS Evolved. An attacker on the same network segment can exploit this vulnerability by sending a malformed EAPOL frame to an 802.1X-enabled interface, gaining root-level code execution or triggering a denial of service that disrupts network operations.

Technologies: [Juniper Networks Junos OS](https://junglewise.ai/threats/technologies/juniper-networks-junos-os), [Juniper Networks Junos OS Evolved](https://junglewise.ai/threats/technologies/junos-os-evolved). Vendors: [Juniper Networks](https://junglewise.ai/threats/vendors/juniper-networks).

## Quick answers

**Is CVE-2026-102015 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102015 being exploited in the wild.

**How severe is CVE-2026-102015?** High severity, with a CVSS score of 8.8, published 14 October 2026.

**Which products and versions are affected?** Juniper Networks Junos OS; Juniper Networks Junos OS Evolved.

**Is there a fix for CVE-2026-102015?** 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-2026-102015 attacked?** It is attacked from the adjacent network, in an operating system.

**Am I affected by CVE-2026-102015?** Check whether you run Juniper Networks Junos OS or Juniper Networks Junos OS Evolved. 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 heap buffer overflow in the secure-dot1xd process allows unauthenticated attackers on adjacent network segments to execute arbitrary code with root privileges or crash the daemon via a specially crafted EAPOL (Extensible Authentication Protocol over LANs) frame sent to an 802.1X-enabled interface. The vulnerability requires no prior authentication but does require network adjacency to reach the vulnerable interface. Successful exploitation grants complete control of the affected network device.

## Affected products

- Juniper Networks Junos OS
- Juniper Networks Junos OS Evolved

## Timeline

- 2026-10-14: disclosed

## References

- [https://supportportal.juniper.net/JSA112187](https://supportportal.juniper.net/JSA112187)

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- [Juniper Junos buffer overflow in SDK service process](https://junglewise.ai/threats/cve-2026-102176-a-buffer-copy-without-checking-size-of-input-classic-buffer)