Is CVE-2021-21320 in the CISA KEV catalog?

No. CVE-2021-21320 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21320?

CVE-2021-21320 has a CVSS v3 base score of 2.6 (LOW).

What is the EPSS score for CVE-2021-21320?

CVE-2021-21320 has an EPSS score of 0.92% (56th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21320?

Upgrade matrix-react-sdk to 3.15.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-21320

LOW

2.6

CVSS v3

NVD

Description

matrix-react-sdk is an npm package which is a Matrix SDK for React Javascript. In matrix-react-sdk before version 3.15.0, the user content sandbox can be abused to trick users into opening unexpected documents. The content is opened with a `blob` origin that cannot access Matrix user data, so messages and secrets are not at risk. This has been fixed in version 3.15.0.

CWE-345

How to fix

Remediation Available

matrix-react-sdkNVD

Affected:< 3.15.0Fixed in:3.15.0CVE-2021-21320derived 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 ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.92%probability of exploitation in 30 days

56thpercentile

Moderate risk: more likely to be exploited than 56% of all known CVEs.

References

Patch2

Third-Party Advisory2

Embed a live status badge for CVE-2021-21320

Markdown

[![CVE-2021-21320](https://tridentstack.com/cve/badge/CVE-2021-21320.svg)](https://tridentstack.com/cve/CVE-2021-21320)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-21320"><img src="https://tridentstack.com/cve/badge/CVE-2021-21320.svg" alt="CVE-2021-21320"></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.