CVE-2020-2503: qnap systems inc. qes Cross-site Scripting
CVSS: 9.0v3.1CriticalModified
Published 24-12-2020Last modified 17-09-2024
Vulnerability summary
CVE-2020-2503 is a critical (CVSS 9.0) Cross-site Scripting vulnerability in qnap systems inc. qes. EPSS estimates a 0.79% chance of exploitation in the next 30 days, higher than 55.5% of scored vulnerabilities.
CVSS score
9.0/10
010
Critical · v3.1 (CVE.org)EPSS score
0.79%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 24-12-2020PublishedVulnerability first disclosed.
- 17-09-2024Last modifiedVulnerability information updated.
Description
If exploited, this stored cross-site scripting vulnerability could allow remote attackers to inject malicious code in File Station. QNAP has already fixed these issues in QES 2.1.1 Build 20201006 and later.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.0Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:HSources2 sources · 5.4–9.0
- NVDNIST5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NDiffers
Low 3.5Preferred score · NVD (NIST)
AV:N/AC:M/Au:S/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
0.79%
Chance of exploitation in the next 30 days
Percentile
56%
Versus all other CVEs
30-day change
0.00 pp
From 0.79% on 20-09-2026
20-09-202620-10-2026
EPSS score0.79%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
- CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.
- CWE-749Exposed Dangerous Method or FunctionThe product provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted.
Affected systems
Qnap1 product
- qes< 2.1.1 | 2.1.1 | 2.1.1:build_20200211 | 2.1.1:build_20200303 | 2.1.1:build_20200319 | 2.1.1:build_20200424 | 2.1.1:build_20200515 | 2.1.1:build_20200811
Qnap systems inc.1 product
- qes≥ unspecified, < 2.1.1
2 vendors · 2 products