Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the signature segment, and the controller accepts the tampered firmware as valid.
History

Wed, 02 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 31 Aug 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Phison Electronics Corporation
Phison Electronics Corporation ps3111-s11 Controller Firmware
Vendors & Products Phison Electronics Corporation
Phison Electronics Corporation ps3111-s11 Controller Firmware

Mon, 31 Aug 2026 11:00:00 +0000

Type Values Removed Values Added
Description Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the signature segment, and the controller accepts the tampered firmware as valid.
Title Phison PS3111-S11 Controller Firmware Signature Verification Bypass
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-08-31T10:51:03.110Z

Updated: 2026-09-02T14:57:25.167Z

Reserved: 2026-08-31T08:38:43.268Z

Link: CVE-2026-82876

cve-icon Vulnrichment

Updated: 2026-09-02T14:57:22.029Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-31T11:16:41.190

Modified: 2026-09-10T15:47:22.273

Link: CVE-2026-82876

cve-icon Redhat

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