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Fencer Vulns
medium 6.5

CVE-2020-28241 json

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

published 2020-11-06 6 y ago modified 2026-09-08 2 mo ago also BIT-libmaxminddb-2020-28241 , EUVD-2020-20725

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

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

Patch / fix

  • bitnami libmaxminddb 1.4.3
  • maxmind libmaxminddb 1.4.3
  • libmaxminddb Debian 14, Debian 13, Debian 12 1.4.3-1

debian advisories DEBIAN-CVE-2020-28241

  • libmaxminddb Ubuntu 20.04 LTS 1.4.2-0ubuntu1.20.04.1
  • libmaxminddb Ubuntu Pro 16.04 LTS 1.0.4-2.1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-28241

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libmaxminddb RHEL 8 1.2.0-10.el8_9.1
  • libmaxminddb RHEL 8.6 EUS 1.2.0-10.el8_6.1
  • libmaxminddb RHEL 8.8 EUS 1.2.0-10.el8_8.1

red hat advisories RHSA-2024:0768RHSA-2024:0751RHSA-2024:0750

  • libmaxminddb AlmaLinux 8 1.2.0-10.el8_9.1

almalinux advisories ALSA-2024:0768

  • libmaxminddb Rocky Linux 8 1.2.0-10.el8_9.1

rocky linux advisories RLSA-2024:0768

  • libmaxminddb Alpine 3.10 1.3.2-r1
  • libmaxminddb Alpine 3.11 1.4.2-r2
  • libmaxminddb Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 1.4.3-r0

alpine advisories ALPINE-CVE-2020-28241

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-28241 updated cvss 6.5

libmaxminddb: improper initialization in dump_entry_data_list() in maxminddb.c

  • Red Hat Enterprise Linux 7 libmaxminddb
    affected: no fix planned “Will not fix”
  • Red Hat Middleware Containers for OpenShift rh-sso-7/sso76-openshift-rhel8 7.6-42, rh-sso-7/sso7-rhel8-operator-bundle 7.6.7-4
    fixed: vendor fix RHSA-2024:1686
  • Red Hat Enterprise Linux AppStream (v. 8) libmaxminddb 1.2.0-10.el8_9.1
    fixed: vendor fix RHSA-2024:0768
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) libmaxminddb 1.2.0-10.el8_6.1
    fixed: vendor fix RHSA-2024:0751
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) libmaxminddb 1.2.0-10.el8_8.1
    fixed: vendor fix RHSA-2024:0750
  • Red Hat Enterprise Linux 9 libmaxminddb
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.16% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/maxmind/libmaxminddb/issues/236 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami libmaxminddb
<1.4.3
1.4.3

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.