CVE-2021-3675: synaTEE.signed.dll Out-Of-Bounds Heap Write

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-06-16 · updated 2026-06-17
Weakness: CWE-20

Description

Improper Input Validation vulnerability in synaTEE.signed.dll of Synaptics Fingerprint Driver allows a local authorized attacker to overwrite a heap tag, with potential loss of confidentiality. This issue affects: Synaptics Synaptics Fingerprint Driver 5.1.xxx.26 versions prior to xxx=340 on x86/64; 5.2.xxxx.26 versions prior to xxxx=3541 on x86/64; 5.2.2xx.26 versions prior to xx=29 on x86/64; 5.2.3xx.26 versions prior to xx=25 on x86/64; 5.3.xxxx.26 versions prior to xxxx=3543 on x86/64; 5.5.xx.1058 versions prior to xx=44 on x86/64; 5.5.xx.1102 versions prior to xx=34 on x86/64; 5.5.xx.1116 versions prior to xx=14 on x86/64; 6.0.xx.1104 versions prior to xx=50 on x86/64; 6.0.xx.1108 versions prior to xx=31 on x86/64; 6.0.xx.1111 versions prior to xx=58 on x86/64.

Affected products

Synaptics Fingerprint Driver: from 5.1.000.26 before 5.1.340.26; from 5.2.0000.26 before 5.2.3541.26; from 5.2.200.26 before 5.2.229.26; from 5.2.300.26 before 5.2.325.26; from 5.3.0000.26 before 5.3.3543.26; from 5.5.00.1058 before 5.5.44.1058 — fixed in 5.1.340.26, 5.2.229.26, 5.2.325.26, 5.2.3541.26, 5.3.3543.26, 5.5.14.1116

How to fix

Upgrade to a fixed version: Synaptics Fingerprint Driver 5.1.340.26, 5.2.229.26, 5.2.325.26, 5.2.3541.26. Check the vendor advisory for mitigations.

References

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