Samsung Smart Switch CVE-2026-21083

Exploitation requires the attacker to occupy the same adjacent network as the victim - defined in the CVSS 4.0 vector as AV:A - meaning the same local subnet, Wi-Fi broadcast domain, Bluetooth range, or equivalent proximity-based channel; internet-based remote exploitation is not possible. User interaction is mandatory (UI:A): the victim must be actively engaged in a Smart Switch data transfer session at the time of the attack. No attacker authentication or privileges are required (PR:N). The vulnerability only affects Smart Switch versions prior to 3.7.72.6. Exploitation is bounded by: (1) adjacent network proximity - ruling out remote unauthenticated internet exploitation; (2) the necessity of an in-progress transfer session combined with victim interaction; and (3) impact confined to confidentiality only, with no integrity or availability effects on the target or subsequent systems.

The CVSS 4.0 score of 6.8 with vector AV:A/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N reflects a moderate-priority vulnerability. The adjacent attack vector (AV:A) is the primary risk limiter - internet-based mass exploitation is not feasible; an attacker must share the same local network or proximity channel with the victim. The mandatory user interaction requirement (UI:A) adds a second constraint, meaning passive scanning is insufficient. The high confidentiality impact (VC:H) is the most concerning signal: successful exploitation could expose all data in transit during a Smart Switch session. No EPSS data was provided in the intelligence feed, and neither KEV listing nor POC availability has been observed, suggesting the threat actor community has not yet weaponized this issue. Overall, this is a real but situationally limited risk - highest for users performing Smart Switch transfers on shared or untrusted Wi-Fi networks (e.g., corporate guest networks, airports, hotels).

An attacker positioned on the same Wi-Fi network as a victim - such as a shared corporate wireless segment or public hotspot - sends malformed or crafted input to the victim's active Smart Switch transfer session. Once the victim interacts with the transfer process (satisfying the UI:A requirement), the attacker's crafted input bypasses validation and triggers unauthorized read access to the sensitive data being transferred, such as contacts, messages, or personal files. No public exploit code has been identified at time of analysis, so exploitation likely requires custom tooling and local network access.