9.8

CVE-2019-20477: fedoraproject fedora Deserialization of Untrusted Data

CVSS: 9.8v3.1CriticalModified
AliasesGHSA-3pqx-4fqf-j49fPYSEC-2020-176UBUNTU-CVE-2019-20477
Published 19-02-2020Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2019-20477 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in fedoraproject fedora. EPSS estimates a 5.11% chance of exploitation in the next 30 days, higher than 92.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
5.11%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2020:4641

Timeline

  1. 19-02-2020
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 4 sources · 3 versions

EPSS trend

Probability

5.11%

Chance of exploitation in the next 30 days

Percentile

92%

Versus all other CVEs

30-day change

0.00 pp

From 5.11% on 21-09-2026

21-09-202621-10-2026
EPSS score
5.11%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • pyyaml< 5.2-1
Fedoraproject1 product
PyPI1 product
  • pyyaml≥ 5.1, < 5.2 | ≥ 5.1, < 5.2b1
Pyyaml1 product
Ubuntu1 product
  • pyyaml< 5.3-1ubuntu2

5 vendors · 5 products

References

15 links
Show all 15 references