Absolute path traversal vulnerability in QES

published 2020-12-24 5y ago modified 2026-06-17 4mo ago also EUVD-2020-22297

cvss: 5.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits: 0; none known

If exploited, this absolute path traversal vulnerability could allow attackers to traverse files in File Station. QNAP has already fixed these issues in QES 2.1.1 Build 20201006 and later.

Patch / fix

fixed in 1

QNAP Systems Inc. QES 2.1.1

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Exploit prediction

1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

QNAP Systems Inc. QES

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory
CWE-73 External Control of File Name or Path
CWE-20 Improper Input Validation
CWE-284 Improper Access Control

References

qnap.com /zh-tw/security-advisory/qsa-20-17
vendor-advisory

Sources

CVE List CVE-2020-2504
NVD CVE-2020-2504

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