CVE-2026-84696

critical

Description

Phison PS3111-S11 controller firmware versions through SBFQT1.3 expose privileged vendor unique commands over the ATA interface with absent or defeatable authentication mechanisms. Attackers can bypass the weak CRC-16 based unlock handshake or exploit builds with no VUC lock to read and write controller memory and raw flash, persisting implants across power cycles.

References

Exploits
More

https://github.com/trulycrisp/psychite

https://github.com/trulycrisp/disksec

https://www.vulncheck.com/advisories/phison-ps3111-s11-controller-firmware-missing-authentication-on-vendor-unique-commands

https://trulycrisp.github.io/drivefirmware/phison_s11/

Details

Source: Mitre, NVD

Published: 2026-09-02

Updated: 2026-09-02

Risk Information

CVSS v2

Base Score: 6.5

Vector: CVSS2#AV:L/AC:L/Au:M/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 8.2

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 9.3

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Severity: Critical

EPSS

EPSS: 0.00149