Home/CVE/A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code e
CVE

CVE-2020-14343

A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code e

A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor.

This flaw is due to an incomplete fix for CVE-2020-1747.

CRITICAL · CVSS 9.8 EPSS 0.13704
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 6% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
CWE-20Improper Input Validation
▤

Affected Products & Versions

2
pyyaml>= 5.1 and < 5.4
oracle communications cloud native core network function cloud native environmentall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI pyyaml CRITICAL fixed in 5.4
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Feb 2021 · 09:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

11
suse-csafopenSUSE-SU-2024:14089-1
suse-csafopenSUSE-SU-2024:11108-1
suse-csafopenSUSE-SU-2024:11210-1
msrcCVE-2020-14343
suse-csafSUSE-SU-2022:3231-1
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1860466Issue TrackingThird Party Advisory
https://github.com/SeldonIO/seldon-core/issues/2252
https://github.com/yaml/pyyaml/issues/420
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlPatchThird Party Advisory
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