Is CVE-2018-12423 in the CISA KEV catalog?

No. CVE-2018-12423 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-12423?

CVE-2018-12423 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-12423?

CVE-2018-12423 has an EPSS score of 1.82% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-12423?

Upgrade matrix-synapse on debian unstable to 0.31.2+dfsg-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2018-12423

HIGHEPSS 76th pctl

7.5

CVSS v3

NVD

Description

In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force.

How to fix

Remediation Available

matrix-synapseDebian

Fixed in:0.31.2+dfsg-1CVE-2018-12423

matrix-synapseUbuntu

Fixed in:0.24.0+dfsg-1ubuntu0.1~esm1USN-6076-1

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 RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

1.82%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Vendor Advisory1

matrix.org

Third-Party Advisory2

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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.