Is CVE-2018-15856 in the CISA KEV catalog?

No. CVE-2018-15856 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-15856?

CVE-2018-15856 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2018-15856?

CVE-2018-15856 has an EPSS score of 0.43% (34th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-15856?

Upgrade libxkbcommon on debian 11 to 0.8.2-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2018-15856

MEDIUM

5.5

CVSS v3

NVD

Description

An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted keymap files.

CWE-835

How to fix

Remediation Available

libxkbcommonDebian

Fixed in:0.8.2-1CVE-2018-15856

libxkbcommonUbuntu

Fixed in:0.4.1-0ubuntu1.1USN-3786-1

Fixed in:0.5.0-1ubuntu2.1USN-3786-1

Fixed in:0.8.0-1ubuntu0.1USN-3786-2

libxkbcommon-x11-0Ubuntu

Fixed in:0.4.1-0ubuntu1.1USN-3786-1

Fixed in:0.5.0-1ubuntu2.1USN-3786-1

Fixed in:0.8.0-1ubuntu0.1USN-3786-2

libxkbcommon0Ubuntu

Fixed in:0.4.1-0ubuntu1.1USN-3786-1

Fixed in:0.5.0-1ubuntu2.1USN-3786-1

Fixed in:0.8.0-1ubuntu0.1USN-3786-2

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.43%probability of exploitation in 30 days

34thpercentile

Low risk: more likely to be exploited than 34% of all known CVEs.

References

Patch2

Third-Party Advisory3

Other references1

access.redhat.com

Related Vulnerabilities

Other CWE-835 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13935	High	7.5	88%	-	Fix
CVE-2020-36227	High	7.5	78%	-	Fix
CVE-2022-0778	High	7.5	71%	-	Fix
CVE-2019-14241	High	7.5	70%	-	-
CVE-2017-16944	High	7.5	63%	-	Fix
CVE-2024-20353	High	8.6	63%	KEV	-

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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.