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CVE-2020-28241: libmaxminddb before 1.4.3 has a heap-based buffer over-read in dump_entry_data_list in maxminddb.c.

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MEDIUM 6.5WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2020-28241 is a medium-severity flaw (CVSS 6.5) affecting libmaxminddb, debian linux, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libmaxminddb before 1.4.3 has a heap-based buffer over-read in dump_entry_data_list in maxminddb.c.

Why this priority

  • Public exploit reference
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance2.2% (top 18%)
CISA exploited listNo
WeaknessCWE-125
Published2020-11-06
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: debian · fedoraproject · maxmind

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

maxmind libmaxminddb UPGRADE
Affected: < 1.4.3
Fixed in: 1.4.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy libmaxminddb || rpm -q libmaxminddb || libmaxminddb --version
2. UPGRADE to 1.4.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade libmaxminddb
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade libmaxminddb
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
debian debian linux MITIGATE
Affected: 9.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 9.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fedoraproject fedora MITIGATE
Affected: 32 · 33
Fixed in: no fixed release known
Safe to downgrade to: a release before 32
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
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-2020-28241?

libmaxminddb: upgrade to 1.4.3; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-28241 being exploited?

CVE-2020-28241 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-2020-28241 affect?

CVE-2020-28241 affects libmaxminddb, debian linux, fedora. Severity is medium (CVSS 6.5). libmaxminddb before 1.4.3 has a heap-based buffer over-read in dump_entry_data_list in maxminddb.c.

How urgent is CVE-2020-28241?

Priority 53/100. Public exploit reference; On your watchlist

Software pages

Debian vulnerabilities

References

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