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.
Published: 2026-08-31
Score: 9.3 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

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'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

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

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

Link: CVE-2026-82876

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-82876

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-31T12:30:05Z

Weaknesses
  • CWE-347

    Improper Verification of Cryptographic Signature