Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2021-3670

Uncontrolled Resource Consumption

Published: Aug 23, 2022 | Modified: Aug 21, 2025
CVSS 3.x
6.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
6.5 MODERATE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Ubuntu
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-3670
CWEhttps://cwe.mitre.org/data/definitions/400.html

MaxQueryDuration not honoured in Samba AD DC LDAP

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

NameVendorStart VersionEnd Version
SambaSamba4.1.0 (including)4.16.0 (excluding)
LdbUbuntubionic*
LdbUbuntuesm-infra/bionic*
LdbUbuntuesm-infra/focal*
LdbUbuntufocal*
LdbUbuntuimpish*
LdbUbuntutrusty/esm*
LdbUbuntuupstream*
SambaUbuntubionic*
SambaUbuntuesm-infra/bionic*
SambaUbuntuesm-infra/focal*
SambaUbuntufocal*
SambaUbuntuimpish*
SambaUbuntutrusty/esm*
SambaUbuntuupstream*

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References

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