CVE-2021-44557: National Library of the Netherlands multiNER <= c0440948057afc6e3d6b4903a7c05e666b94a3bc is affected by an XML

Q: How do I fix CVE-2021-44557?

multiner: upgrade to 08-25-2021. Exact commands for each OS are on this page.

Q: Is CVE-2021-44557 being exploited?

CVE-2021-44557 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-44557 affect?

CVE-2021-44557 affects multiner. Severity is critical (CVSS 9.1). 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 coul

Q: How urgent is CVE-2021-44557?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2021-44557 is a critical-severity flaw (CVSS 9.1) affecting multiner. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-611
Published	2021-12-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kb

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-08 12:15 UTCPublished CVE record published
2026-06-17 04:12 UTCUpdated Record last modified

kb multiner UPGRADE

Affected: < 08-25-2021

Fixed in: 08-25-2021

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy multiner || rpm -q multiner || multiner --version

2. UPGRADE to 08-25-2021 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade multiner

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade multiner

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-44557?

multiner: upgrade to 08-25-2021. Exact commands for each OS are on this page.

Is CVE-2021-44557 being exploited?

CVE-2021-44557 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-44557 affect?

CVE-2021-44557 affects multiner. Severity is critical (CVSS 9.1). 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 coul

How urgent is CVE-2021-44557?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

References

← Back to latest CVEs