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CVE-2018-19943

66
FAUCET Score

CVE-2018-19943 is a cross-site scripting (XSS) vulnerability affecting QNAP QTS operating systems, allowing remote attackers to inject malicious code. With a CVSS score of 5.4 (Medium), it requires user interaction and low privileges but can lead to limited confidentiality and integrity impacts. This vulnerability is actively exploited, notably by the eCh0raix ransomware campaign, despite a lack of public exploit code. QNAP has released patches for various QTS versions to address this issue.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.2.6CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 4.3.1.0013, < 4.3.3.1252CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 4.3.4, < 4.3.4.1282CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 4.3.6, < 4.3.6.1263CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 4.4.0, < 4.4.1.1261CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.0HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.3
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
17.71%
Probability of exploitation in next 30 days
EPSS Percentile
96.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Added to KEV · May 24, 2022
This CVE's current EPSS score of 0.1771 is in the 99th percentile among its peer group of 15,224 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
qnap.com / zh-tw/security-advisory/qsa-20-01
Vendor Advisory