Is CVE-2022-39374 in the CISA KEV catalog?

No. CVE-2022-39374 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-39374?

CVE-2022-39374 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2022-39374?

CVE-2022-39374 has an EPSS score of 0.94% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-39374?

Upgrade matrix-synapse on debian unstable to 1.68.0-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2022-39374

MEDIUM

6.5

CVSS v3

NVD

Description

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room. This can be exploited in a way that causes all further messages and state changes sent in that room from the vulnerable homeserver to be rejected. This issue has been patched in version 1.68.0

CWE-400Resource Exhaustion

How to fix

Remediation Available

matrix-synapseDebian

Fixed in:1.68.0-1CVE-2022-39374

matrix-synapseUbuntu

Fixed in:0.24.0+dfsg-1ubuntu0.1~esm4USN-7444-1

Fixed in:1.11.0-1ubuntu0.1~esm2USN-7444-1

Fixed in:1.53.0-1ubuntu0.1~esm2USN-7444-1

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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.94%probability of exploitation in 30 days

57thpercentile

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

References

Patch1

github.com

Vendor Advisory1

github.com

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	89%	-	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 2025-02-13.