Is CVE-2021-42136 in the CISA KEV catalog?

No. CVE-2021-42136 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42136?

CVE-2021-42136 has a CVSS v3 base score of 9.0 (CRITICAL).

What is the EPSS score for CVE-2021-42136?

CVE-2021-42136 has an EPSS score of 4.66% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42136?

Upgrade redcap to 11.4.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-42136

CRITICALEPSS 91th pctl

9.0

CVSS v3

NVD

Description

A stored Cross-Site Scripting (XSS) vulnerability in the Missing Data Codes functionality of REDCap before 11.4.0 allows remote attackers to execute JavaScript code in the client's browser by storing said code as a Missing Data Code value. This can then be leveraged to execute a Cross-Site Request Forgery attack to escalate privileges to administrator.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

redcapNVD

Affected:< 11.4.0Fixed in:11.4.0CVE-2021-42136derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.66%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Exploit1

packetstormsecurity.com

Third-Party Advisory1

redcap.med.usc.edu

Product1

project-redcap.org

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

Embed a live status badge for CVE-2021-42136

Markdown

[![CVE-2021-42136](https://tridentstack.com/cve/badge/CVE-2021-42136.svg)](https://tridentstack.com/cve/CVE-2021-42136)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-42136"><img src="https://tridentstack.com/cve/badge/CVE-2021-42136.svg" alt="CVE-2021-42136"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.