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CVE-2019-20477

CRITICAL
9.8
CVSS Score
Published: February 19, 2020 at 03:09 AM UTC
Updated: June 17, 2026 at 02:30 AM UTC
2 products affected across 2 vendorsFedoraPyyaml

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Severity
CRITICAL9.8
Exploit prediction
EPSS 5%

Description

PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
3031
Pyyaml· Pyyaml
95%
5.1 ≤ v ≤ 5.1.2

References (4)

x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/yaml/pyyaml/blob/master/CHANGES
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H/
x_refsource_MISCExploitThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.exploit-db.com/download/47655

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-502

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