CVE-2023-34971: QTS, QuTS hero

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-24 · updated 2026-06-17
Weakness: CWE-326

Description

An inadequate encryption strength vulnerability has been reported to affect QNAP operating systems. If exploited, the vulnerability possibly allows local network clients to decrypt the data using brute force attacks via unspecified vectors. We have already fixed the vulnerability in the following versions: QTS 5.0.1.2425 build 20230609 and later QTS 5.1.0.2444 build 20230629 and later QTS 4.5.4.2467 build 20230718 and later QuTS hero h5.1.0.2424 build 20230609 and later QuTS hero h4.5.4.2476 build 20230728 and later

Affected products

QNAP QTS: from 4.5.4 before 4.5.4.2467; from 5.0.1 before 5.0.1.2425; from 5.1.0 before 5.1.0.2444 — fixed in 4.5.4.2467, 5.0.1.2425, 5.1.0.2444
QNAP Systems Inc. QuTS hero: from h4.5.4 before h4.5.4.2476; from h5.1.0 before h5.1.0.2424 — fixed in h4.5.4.2476, h5.1.0.2424

How to fix

Upgrade to a fixed version: QNAP QTS 4.5.4.2467, 5.0.1.2425, 5.1.0.2444; QNAP Systems Inc. QuTS hero h4.5.4.2476, h5.1.0.2424. Check the vendor advisory for mitigations.

References

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