What is the CVSS score of CVE-2021-3646?

CVE-2021-3646 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.8%.

Is there a public PoC exploit available for CVE-2021-3646?

Yes, a public proof-of-concept exploit is available for CVE-2021-3646. Prioritise patching immediately. EPSS: 0.8%.

Is there a patch available for CVE-2021-3646?

Yes, a patch is available for CVE-2021-3646. Update the affected software to the latest version immediately.

Btcpay Server CVE-2021-3646

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2021-09-10 security@huntr.dev

XSS Btcpay Server

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Low

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Sep 10, 2021 - 18:15 nvd

MEDIUM 6.1

DescriptionNVD

btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

AnalysisAI

btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Affected products include: Btcpayserver Btcpay Server.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.