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CVE-2018-19953

72
FAUCET Score

CVE-2018-19953 is a cross-site scripting (XSS) vulnerability affecting QNAP QTS, which could allow remote attackers to inject malicious code. This vulnerability has a CVSS score of 6.1 (Medium) and a FAUCET Risk Score of 99/100, indicating a significant risk due to its network-based attack vector and low attack complexity, potentially leading to partial confidentiality and integrity impacts. Notably, this CVE is actively exploited, specifically in known eCh0raix ransomware campaigns targeting QNAP NAS devices, despite no public Metasploit or ExploitDB modules. The vulnerability has garnered considerable community discussion, with 11 mentions, and has been addressed by QNAP in various QTS versions.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.2.6CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 4.3.1.0013, < 4.3.3.1161CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 4.3.4, < 4.3.4.1190CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 4.3.6, < 4.3.6.1218CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 4.4.0, < 4.4.1.1201CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
23.89%
Probability of exploitation in next 30 days
EPSS Percentile
97.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
Added to KEV · May 24, 2022
This CVE's current EPSS score of 0.2389 is in the 99th percentile among its peer group of 26,209 CVEs.

Social Chatter

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

Media Mentions

The average CVE in this peer group has 0.1 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