Is CVE-2021-39183 in the CISA KEV catalog?

No. CVE-2021-39183 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-39183?

CVE-2021-39183 has a CVSS v3 base score of 8.2 (HIGH).

What is the EPSS score for CVE-2021-39183?

CVE-2021-39183 has an EPSS score of 0.75% (50th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-39183?

Upgrade owncast to 0.0.9 or later.

CVE & CISA-KEV Catalog

CVE-2021-39183

HIGH

8.2

CVSS v3

NVD

Description

Owncast is an open source, self-hosted live video streaming and chat server. In affected versions inline scripts are executed when Javascript is parsed via a paste action. This issue is patched in 0.0.9 by blocking unsafe-inline Content Security Policy and specifying the script-src. The worker-src is required to be set to blob for the video player.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

owncastNVD

Affected:< 0.0.9Fixed in:0.0.9CVE-2021-39183derived 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

ConfidentialityLow

IntegrityHigh

AvailabilityLow

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

Exploit Intelligence

0.75%probability of exploitation in 30 days

50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Patch1

github.com

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-2021-39183

Markdown

[![CVE-2021-39183](https://tridentstack.com/cve/badge/CVE-2021-39183.svg)](https://tridentstack.com/cve/CVE-2021-39183)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-39183"><img src="https://tridentstack.com/cve/badge/CVE-2021-39183.svg" alt="CVE-2021-39183"></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.