Is CVE-2019-20857 in the CISA KEV catalog?

No. CVE-2019-20857 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-20857?

CVE-2019-20857 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2019-20857?

CVE-2019-20857 has an EPSS score of 1.11% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-20857?

Upgrade mattermost server to 5.16.0 or later.

CVE & CISA-KEV Catalog

CVE-2019-20857

HIGH

7.5

CVSS v3

NVD

Description

An issue was discovered in Mattermost Server before 5.16.0. It allows attackers to cause a denial of service (markdown renderer hang) via many backtick characters.

How to fix

Remediation Available

mattermost serverNVD

Affected:< 5.16.0Fixed in:5.16.0CVE-2019-20857derived 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 RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.11%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Vendor Advisory1

mattermost.com

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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.