CVE-2021-44557

Name: CVE-2021-44557
Creator: NVD / NIST
Published: 2021-12-08T12:15:08.023+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.26%

Last modified Jun 17, 2026

CVE-2021-44557 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. National Library of the Netherlands multiNER <= c0440948057afc6e3d6b4903a7c05e666b94a3bc is affected by an XML External Entity (XXE) vulnerability in multiNER/ner.py. Since XML parsing resolves external entities, a malicious XML stream could leak internal files and/or cause a DoS.. EPSS estimates a 1.26% chance of exploitation in the next 30 days.

Description

National Library of the Netherlands multiNER <= c0440948057afc6e3d6b4903a7c05e666b94a3bc is affected by an XML External Entity (XXE) vulnerability in multiNER/ner.py. Since XML parsing resolves external entities, a malicious XML stream could leak internal files and/or cause a DoS.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

1.26%

65.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions
Kb	Multiner	< 08-25-2021

References

https://github.com/KBNLresearch/multiNERProduct, Third Party Advisory
https://github.com/KBNLresearch/multiNER/pull/3Patch, Third Party Advisory
https://github.com/KBNLresearch/multiNERProduct, Third Party Advisory
https://github.com/KBNLresearch/multiNER/pull/3Patch, Third Party Advisory

Timeline

Published: Dec 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-44557?

How severe is CVE-2021-44557?

CVE-2021-44557 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.26% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44557?

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-2021-44557?

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

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Source: NVD / NIST