VDB-169559 · CVE-2020-14343 · Nessus 240021

PyYAML up to 5.3 YAML File full_load input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in PyYAML up to 5.3. It has been classified as problematic. Impacted is the function full_load of the component YAML File Handler. The manipulation leads to input validation. This vulnerability is traded as CVE-2020-14343. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in PyYAML up to 5.3. It has been rated as problematic. This issue affects the function full_load of the component YAML File Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability.

The weakness was shared 02/10/2021. It is possible to read the advisory at bugzilla.redhat.com. The identification of this vulnerability is CVE-2020-14343. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 240021 (TencentOS Server 3: PyYAML (TSSA-2022:0177)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (240021). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

PyYAML

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.6

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 240021
Nessus Name: TencentOS Server 3: PyYAML (TSSA-2022:0177)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: PyYAML 5.4

Timelineinfo

06/17/2020 🔍
02/10/2021 +238 days 🔍
02/10/2021 +0 days 🔍
06/17/2025 +1588 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2020-14343 (🔍)
GCVE (CVE): GCVE-0-2020-14343
GCVE (VulDB): GCVE-100-169559

Entryinfo

Created: 02/10/2021 07:32
Updated: 06/17/2025 15:45
Changes: 02/10/2021 07:32 (37), 02/26/2021 15:09 (5), 02/26/2021 15:13 (18), 06/17/2025 15:45 (17)
Complete: 🔍
Cache ID: 216::103