Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2019-20398

NULL Pointer Dereference

Published: Jan 22, 2020 | Modified: Nov 21, 2024
CVSS 3.x
6.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.x
4.3 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
5.5 LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2019-20398
CWEhttps://cwe.mitre.org/data/definitions/476.html

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.

Weakness

The product dereferences a pointer that it expects to be valid but is NULL.

Affected Software

NameVendorStart VersionEnd Version
LibyangCesnet0.11-r1 (including)0.11-r1 (including)
LibyangCesnet0.11-r2 (including)0.11-r2 (including)
LibyangCesnet0.12-r1 (including)0.12-r1 (including)
LibyangCesnet0.12-r2 (including)0.12-r2 (including)
LibyangCesnet0.13-r1 (including)0.13-r1 (including)
LibyangCesnet0.13-r2 (including)0.13-r2 (including)
LibyangCesnet0.14-r1 (including)0.14-r1 (including)
LibyangCesnet0.15-r1 (including)0.15-r1 (including)
LibyangCesnet0.16-r1 (including)0.16-r1 (including)
LibyangCesnet0.16-r2 (including)0.16-r2 (including)
LibyangCesnet0.16-r3 (including)0.16-r3 (including)
LibyangCesnet1.0-r1 (including)1.0-r1 (including)
LibyangCesnet1.0-r2 (including)1.0-r2 (including)
Red Hat Enterprise Linux 8RedHatlibyang-0:1.0.184-1.el8*
LibyangUbuntueoan*
LibyangUbuntuesm-apps/focal*
LibyangUbuntufocal*
LibyangUbuntugroovy*
LibyangUbuntuhirsute*
LibyangUbuntutrusty*
LibyangUbuntuupstream*

Potential Mitigations

References

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