CVE-2020-18703

Name: CVE-2020-18703
Creator: NVD / NIST
Published: 2021-08-16T18:15:07.17+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.77%

Last modified Jun 17, 2026

CVE-2020-18703 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.. EPSS estimates a 2.77% chance of exploitation in the next 30 days.

Description

XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.

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

2.77%

84.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions
Quokka Project	Quokka	0.4.0

References

https://github.com/rochacbruno/quokka/issues/676Exploit, Patch, Third Party Advisory
https://github.com/rochacbruno/quokka/issues/676Exploit, Patch, Third Party Advisory

Timeline

Published: Aug 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-18703?

XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.

How severe is CVE-2020-18703?

CVE-2020-18703 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.77% probability of exploitation in the next 30 days.

How do I fix CVE-2020-18703?

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-2020-18703?

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

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Source: NVD / NIST