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CVE-2020-1747

CRITICALCVSS 9.8/10EPSS 5.30%

Last modified

CVE-2020-1747 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A vulnerability was discovered in the PyYAML library in versions before 5.3.1, 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. EPSS estimates a 5.30% chance of exploitation in the next 30 days.

Description

A vulnerability was discovered in the PyYAML library in versions before 5.3.1, 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. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/new constructor.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
5.30%

91.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
PyyamlPyyaml>= 5.1, < 5.3.1
FedoraprojectFedora30
FedoraprojectFedora31
FedoraprojectFedora32
FedoraprojectFedora33
OpensuseLeap15.1
OracleCommunications Cloud Native Core Network Function Cloud Native Environment22.1.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-1747?
A vulnerability was discovered in the PyYAML library in versions before 5.3.1, 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. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/new constructor.
How severe is CVE-2020-1747?
CVE-2020-1747 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 5.30% probability of exploitation in the next 30 days.
How do I fix CVE-2020-1747?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-1747?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST