by Kastro
Paper/Archive/CVE-2026-84696

CVE-2026-84696

Phison Electronics Corporation PS3111-S11 Controller Firmware — Phison PS3111-S11 Controller Firmware Missing Authentication on Vendor Unique Commands

EPSS 0.2%public exploitCVSS 9.3
critical.is priorityof 100
40
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 12.7.127 × 202.5Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
PS3111-S11 Controller FirmwareSBFQT1.3–CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
VulnCheck (CNA)8.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

writeuptrulycrisp.github.io/drivefirmware/phison_s11exploitgithub.com/trulycrisp/psychiteexploitgithub.com/trulycrisp/disksecwriteupvulncheck.com/advisories/phison-ps3111-s11-controller-firmware-missing-authentication-on-vendor-unique-commands