Is CVE-2022-39203 in the CISA KEV catalog?

No. CVE-2022-39203 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-39203?

CVE-2022-39203 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2022-39203?

CVE-2022-39203 has an EPSS score of 0.72% (49th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-39203?

Upgrade matrix irc bridge to 0.35.0 or later.

CVE & CISA-KEV Catalog

CVE-2022-39203

HIGH

8.8

CVSS v3

NVD

Description

matrix-appservice-irc is an open source Node.js IRC bridge for Matrix. Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel. The vulnerability has been patched in matrix-appservice-irc 0.35.0. As a workaround operators may disable dynamic channel joining via `dynamicChannels.enabled` to prevent users from joining new channels, which prevents any new channels being bridged outside of what is already bridged, and what is specified in the config.

CWE-269Improper Privilege Management

How to fix

Remediation Available

matrix irc bridgeNVD

Affected:< 0.35.0Fixed in:0.35.0CVE-2022-39203derived 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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.72%probability of exploitation in 30 days

49thpercentile

Moderate risk: more likely to be exploited than 49% of all known CVEs.

References

Vendor Advisory1

matrix.org

Mitigation1

github.com

Related Vulnerabilities

Other CWE-269 (Improper Privilege Management) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12635	Critical	9.8	100%	-	Fix
CVE-2022-24637	Critical	9.8	99%	-	Fix
CVE-2017-5689	Critical	9.8	92%	KEV	Fix
CVE-2020-3243	Critical	9.8	88%	-	-
CVE-2024-21888	High	8.8	87%	-	-
CVE-2022-0441	Critical	9.8	85%	-	Fix

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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.