Is CVE-2019-18835 in the CISA KEV catalog?

No. CVE-2019-18835 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-18835?

CVE-2019-18835 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2019-18835?

CVE-2019-18835 has an EPSS score of 0.86% (55th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-18835?

Upgrade matrix-synapse on debian unstable to 1.5.0-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2019-18835

CRITICAL

9.8

CVSS v3

NVD

Description

Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.

CWE-345

How to fix

Remediation Available

matrix-synapseDebian

Fixed in:1.5.0-1CVE-2019-18835

matrix-synapseUbuntu

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

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.86%probability of exploitation in 30 days

55thpercentile

Moderate risk: more likely to be exploited than 55% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

github.com

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%	-	-

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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.