No exploitation reportedFix available

CVE-2020-2499

Q: Is CVE-2020-2499 actively exploited?

Active exploitation of CVE-2020-2499 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-2499?

CVE-2020-2499 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2020-12-24
Fixed in2.1.1
WeaknessCWE-259 · CWE-522 · CWE-798

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A hard-coded password vulnerability has been reported to affect earlier versions of QES. If exploited, this vulnerability could allow attackers to log in with a hard-coded password. QNAP has already fixed the issue in QES 2.1.1 Build 20200515 and later.

Timeline

dates in UTC

2020-12-2402:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-2499?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-2499?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Qnap qes

Branch	Affected	Fixed in	Source
2.1	< 2.1.1	2.1.1	NVD
2.1	= 2.1.1	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Qnap qes to 2.1.1

Advisories and patches

www.qnap.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.16.3read 2026-10-23
NVDCVSS 3.17.2read 2026-10-23
NVDCVSS 2.04read 2026-10-23
CNAweakness (CWE)CWE-259, CWE-522, CWE-798read 2026-10-23
NVDweakness (CWE)CWE-798read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2020-12-24
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-2499?

Is CVE-2020-2499 actively exploited?

Active exploitation of CVE-2020-2499 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-2499?

CVE-2020-2499 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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