HOMEVULNERABILITIESCVE-2020-14343
CRITICAL

CVE-2020-14343

CWE-20Published: February 9, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2020-14343 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Oracle1 product(s)
communications cloud native core network function cloud native environment
pyyaml1 product(s)
pyyaml
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://www.oracle.com/security-alerts/cpujul2022.html
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://www.oracle.com/security-alerts/cpujul2022.html
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1860466
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1860466

All References (10)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1860466Issue Tracking · Third Party Advisory
→
https://github.com/SeldonIO/seldon-core/issues/2252
→
https://github.com/yaml/pyyaml/issues/420
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1860466Issue Tracking · Third Party Advisory
→
https://github.com/SeldonIO/seldon-core/issues/2252
→
https://github.com/yaml/pyyaml/issues/420
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch · Third Party Advisory

Quick Facts

CVE IDCVE-2020-14343
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-20
CISA KEVNo
Affected2 vendor(s)
PublishedFeb 9, 2021

Related CVEs (CWE-20)

CVE-2008-6556
10.0
CVE-2008-4770
10.0
CVE-2008-5014
10.0
CVE-2009-0258
10.0
CVE-2008-5810
10.0
CVE-2008-4559
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-14343 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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