EUVD-2026-68462
GHSA-r5jx-v7f9-8wxc
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Requires privileged local access to flash firmware (PR:H, AV:L); compromised controller firmware breaks out to affect the host/all stored data, so S:C with full C/I/A impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Firmware signature verification bypass in Phison PS3111-S11 SATA SSD controller firmware allows an attacker to load arbitrary, attacker-signed firmware onto the drive. Because the controller validates RSA signatures against a public modulus stored inside the firmware image itself instead of an immutable hardware root of trust, an attacker can generate their own RSA key pair, sign malicious firmware, embed the matching modulus, and have the controller accept it as authentic. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ability to issue firmware-update commands to the PS3111-S11 controller, which per CVSS PR:H and AV:L means local high-privilege access - host administrator/root or physical/debug (JTAG) access to the drive - not remote or network exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a high-severity but access-gated issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch identified at time of analysis, and because the flaw is in how the trust root is anchored, a fix likely requires updated firmware or hardware that validates signatures against an immutable/OTP-stored key rather than a modulus carried in the image; monitor Phison and the downstream SSD vendor for firmware updates and confirm any fix independently before relying on it. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all systems to identify Phison PS3111-S11 SSDs by model number and disable firmware auto-update features where possible. …
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External POC / Exploit Code
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