CVE-2026-84696: Missing Authentication for Critical Function in Phison Electronics Corporation PS3111-S11 Controller Firmware
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.
CVSS v4.0
Score 9.3critical
Affected software
Phison Electronics Corporation
PS3111-S11 Controller Firmware
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Phison PS3111-S11 controller firmware versions through SBFQT1.3 contain a missing authentication vulnerability for critical functions. Privileged vendor unique commands (VUCs) are exposed over the ATA interface without effective authentication. Attackers can bypass the weak CRC-16 based unlock handshake or exploit firmware builds with no VUC lock, allowing them to read and write controller memory and raw flash. This vulnerability enables persistence of implants even after power cycles. The CVSS 4.0 score is 9.3, indicating a critical severity. The product is a cloud service, and the vendor manages remediation server-side.
Potential Impact
An attacker with high privileges can bypass weak or absent authentication mechanisms to access and modify controller memory and raw flash on affected PS3111-S11 firmware. This can lead to persistent implants that survive power cycles, potentially compromising device integrity and security.
Mitigation Recommendations
The vendor manages remediation for this cloud-hosted service. A patch is available, and users should consult the vendor advisory for current remediation guidance. Patch status is not yet confirmed in the provided data; therefore, check the vendor advisory for the latest update on patch availability and application.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-01T23:24:17.537Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Is Cloud Service
- true
Threat ID: 6a977a61acd9273b49923c2e
Added to database: 09/02/2026, 01:22:41 UTC
Last enriched: 09/07/2026, 13:59:56 UTC
Last updated: 10/15/2026, 18:48:24 UTC
Views: 75
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