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Fencer Vulns
medium 6.5

CVE-2021-3670 json

MaxQueryDuration not honoured in Samba AD DC LDAP

published 2022-08-23 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26962

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

MaxQueryDuration not honoured in Samba AD DC LDAP

Patch / fix

  • samba samba 4.16.0
  • samba Debian 14, Debian 13, Debian 12 2:4.16.0+dfsg-2

debian advisories DEBIAN-CVE-2021-3670

  • ldb Ubuntu 20.04 LTS 2:2.2.3-0ubuntu0.20.04.3
  • samba Ubuntu 20.04 LTS 2:4.13.17~dfsg-0ubuntu1.20.04.1

ubuntu advisories UBUNTU-CVE-2021-3670

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

  • samba SLE Module for Basesystem 15 SP4, SLE High Availability Extension 15 SP4, openSUSE Leap 15.4 4.15.7+git.376.dd43aca9ab2-150400.3.5.3
  • ldb SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 2.4.2-150400.4.3.11
  • ldb SLE Module for Basesystem 15 SP3, SLE Micro 5.2, SLE Micro 5.1 +2 more 2.4.2-150300.3.15.1

suse advisories SUSE-SU-2022:2307-1SUSE-SU-2022:1576-1

  • ldb openSUSE Tumbleweed 2.4.2-1.1

opensuse advisories openSUSE-SU-2024:11882-1

  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 4.15.9-r0

alpine advisories ALPINE-CVE-2021-3670

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-2021-3670 updated cvss 6.5

samba: MaxQueryDuration not honoured in Samba AD DC LDAP

  • Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more Red Hat Enterprise Linux 8 ctdb, samba, libnetapi, ctdb-tests, samba-libs, samba-pidl, +24 more Red Hat Enterprise Linux 9 ctdb, samba, libldb, ldb-tools, libnetapi, samba-libs, +27 more Red Hat Storage 3 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +21 more Red Hat Virtualization 4 samba
    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

2.33% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a samba

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.