CVE-2014-0021

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

7.5 HighFix available

CVE-2014-0021 is a high vulnerability (CVSS 7.5) in Chrony, published February 11, 2014. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.17%, the 90th percentile. Fixed in chrony 1.29.1-1.

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

4.17%Up 2.6 points since Feb 4, 2022

What each source reports

NVD Score used 7.5

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Record: CVE-2014-0021
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Updated: 2026-11-02

CVE List No score

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Record: CVE-2014-0021
Updated: 2026-11-02

EUVDEUVD-2014-0122 No score

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Record: EUVD-2014-0122
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4xjv-r88q-f87j 7.5

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Record: GHSA-4xjv-r88q-f87j
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVAZL-110379 7.5

CVE-2014-0021 affecting package chrony 4.5-1

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Record: AZL-110379
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSV 7.5

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Record: CVE-2014-0021
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

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OSVDEBIAN-CVE-2014-0021 7.5

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Record: DEBIAN-CVE-2014-0021
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2014-0021 7.5

Chrony before 1.29.1 has traffic amplification in cmdmon protocol

Record: UBUNTU-CVE-2014-0021
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVMGASA-2014-0052 No score

Updated chrony package fixes security vulnerability

Updated chrony package fixes security vulnerability:

In the chrony control protocol some replies are significantly larger than their requests, which allows an attacker to use it in an amplification attack (CVE-2014-0021).

Note: in the default configuration, cmdallow is restricted to localhost, so significant amplification is only possible if the configuration has been changed to allow cmdallow from other hosts. Even from hosts whose access is denied, minor amplification is still possible.

Record: MGASA-2014-0052
Updated: 2026-11-02

OSVopenSUSE-SU-2024:10345-1 No score

chrony-2.4.1-1.1 on GA media

These are all security issues fixed in the chrony-2.4.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:10345-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`chrony` Azure Linux:3	through 4.5-1	None known
`chrony` Debian:12	before 1.29.1-1	1.29.1-1
`chrony` Debian:13	before 1.29.1-1	1.29.1-1
`chrony` Debian:14	before 1.29.1-1	1.29.1-1
`chrony` Mageia:4	before 1.29.1-1.mga4	1.29.1-1.mga4
`chrony` Ubuntu:Pro:14.04:LTS	before 1.29-1ubuntu0.1+esm1, plus listed versions 1.26-41.29-11.29-1ubuntu0.1	1.29-1ubuntu0.1+esm1
`chrony` openSUSE:Tumbleweed	before 2.4.1-1.1	2.4.1-1.1

History

History
When	Changed	Sources
2026-11-03	aliases	EUVD
2026-11-02	created	CVE List, GitHub Advisories, NVD, OSV

References

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