CVE-2021-21320

Q: How do I fix CVE-2021-21320?

Upgrade matrix-react-sdk to 3.15.0 or later.

Q: Is CVE-2021-21320 being actively exploited?

Not that we know of. CVE-2021-21320 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.92% is the estimated probability that it will be exploited in the next 30 days. That is higher than 57% of all scored CVEs.

Q: How severe is CVE-2021-21320?

CVE-2021-21320 has a CVSS v3 base score of 2.6, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-21320 affect?

Published advisories record a fix for matrix-react-sdk (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Patch2

Third-Party Advisory2

Related Vulnerabilities

Other CWE-345 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-38831	High	7.8	98%	KEV + Ransom	Fix
CVE-2016-4553	High	8.6	80%	-	Fix
CVE-2016-4554	High	8.6	39%	-	Fix
CVE-2023-35719	Medium	6.8	26%	-	-
CVE-2022-26871	Critical	9.8	20%	KEV	-
CVE-2014-4936	High	9.3	17%	-	-

Common questions

How do I fix CVE-2021-21320?

Upgrade matrix-react-sdk to 3.15.0 or later.

Is CVE-2021-21320 being actively exploited?

Not that we know of. CVE-2021-21320 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.92% is the estimated probability that it will be exploited in the next 30 days. That is higher than 57% of all scored CVEs.

How severe is CVE-2021-21320?

CVE-2021-21320 has a CVSS v3 base score of 2.6, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-21320 affect?

Published advisories record a fix for matrix-react-sdk (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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.

See how it works Start freeThis CVE lookup is free and always will be.

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.