Quick answers
- Is CVE-2025-66366 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-66366 being exploited in the wild.
- How severe is CVE-2025-66366?
- Informational severity, published 5 November 2026.
- Which products and versions are affected?
- Samsung Exynos <UNKNOWN>.
- Is there a fix for CVE-2025-66366?
- 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-2025-66366 attacked?
- It is attacked over the network or from the adjacent network, in device firmware.
- Am I affected by CVE-2025-66366?
- Check whether you run Samsung Exynos 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
The vulnerability exists in the baseband's RRC Setup message handler, which fails to properly validate authentication on downlink RRC Setup messages. An attacker on the network (adjacent attack vector via cellular tower compromise or spoofing) can send a crafted unauthenticated RRC Setup message that triggers a crash in the baseband processor. This is a denial-of-service condition affecting device connectivity.
Affected products
- Samsung Exynos <UNKNOWN>
Timeline
- 2026-11-05: disclosed