Is CVE-2019-20398 in the CISA KEV catalog?

No. CVE-2019-20398 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-20398?

CVE-2019-20398 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2019-20398?

CVE-2019-20398 has an EPSS score of 1.82% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-20398?

Upgrade libyang on debian 11 to 1.0.176-1 or later.

CVE & CISA-KEV Catalog

CVE-2019-20398

MEDIUMEPSS 76th pctl

6.5

CVSS v3

NVD

Description

A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

libyangDebian

Fixed in:1.0.176-1CVE-2019-20398

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

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

Patch2

Exploit1

github.com

Third-Party Advisory1

github.com

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	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 2024-11-21.