Quick answers
- Is CVE-2026-103408 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103408 being exploited in the wild.
- How severe is CVE-2026-103408?
- High severity, with a CVSS score of 8.8, published 28 October 2026.
- Which products and versions are affected?
- Juniper Networks Session Smart Router.
- Is there a fix for CVE-2026-103408?
- 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-2026-103408 attacked?
- It is attacked from the adjacent network, in a network appliance.
- Am I affected by CVE-2026-103408?
- Check whether you run Juniper Networks Session Smart Router. 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 buffer overflow in the DHCP client fails to properly validate the length of DHCP reply fields, allowing an unauthenticated attacker on the adjacent network to trigger memory corruption. The vulnerability requires no authentication and can be exploited by sending a specially crafted DHCP response to achieve remote code execution on the Session Smart Router.
Affected products
- Juniper Networks Session Smart Router
Timeline
- 2026-10-28: disclosed