How severe is CVE-2012-4503?

CVE-2012-4503 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2012-4503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-4503?

CVE-2012-4503 primarily affects Tuxfamily Chrony. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-4503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-4503 published?

CVE-2012-4503 was published on 2013-11-05 and last updated on 2026-06-16.

CVE-2012-4503

CVE-2012-4503 is a medium-severity vulnerability in Tuxfamily Chrony with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Tuxfamily Chrony
Published: 2013-11-05
Last modified: 2026-06-16

Description

cmdmon.c in Chrony before 1.29 allows remote attackers to obtain potentially sensitive information from stack memory via vectors related to (1) an invalid subnet in a RPY_SUBNETS_ACCESSED command to the handle_subnets_accessed function or (2) a RPY_CLIENT_ACCESSES command to the handle_client_accesses function when client logging is disabled, which causes uninitialized data to be included in a reply.

Frequently asked questions

What is CVE-2012-4503?: cmdmon.c in Chrony before 1.29 allows remote attackers to obtain potentially sensitive information from stack memory via vectors related to (1) an invalid subnet in a RPY_SUBNETS_ACCESSED command to the handle_subnets_accessed function or (2) a RPY_CLIENT_ACCESSES command to the handle_client_accesses function when client logging is disabled, which causes uninitialized data to be included in a reply.
How severe is CVE-2012-4503?: CVE-2012-4503 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2012-4503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-4503?: CVE-2012-4503 primarily affects Tuxfamily Chrony. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-4503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-4503 published?: CVE-2012-4503 was published on 2013-11-05 and last updated on 2026-06-16.

References

Affected products (24)

cpe:2.3:a:tuxfamily:chrony:*:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.0:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.1:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.18:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.19:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.19.99.1:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.19.99.2:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.19.99.3:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.20:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.21:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.21:pre1:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.23:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.23:pre1:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.23.1:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.24:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.24:pre1:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.25:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.25:pre1:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.25:pre2:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.26:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.26:pre1:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.27:*:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.27:pre1:*:*:*:*:*:*
cpe:2.3:a:tuxfamily:chrony:1.28:pre1:*:*:*:*:*:*

More vulnerabilities in Tuxfamily Chrony

CVE-2016-1567 — High (CVSS 8.1): chrony before 1.31.2 and 2.x before 2.2.1 do not verify peer associations of symmetric keys when authenticating…
CVE-2015-1853 — Medium (CVSS 6.5): chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which…
CVE-2015-1822 — Medium (CVSS 6.5): chrony before 1.31.1 does not initialize the last "next" pointer when saving unacknowledged replies to command…
CVE-2015-1821 — Medium (CVSS 6.5): Heap-based buffer overflow in chrony before 1.31.1 allows remote authenticated users to cause a denial of service…
CVE-2020-14367 — Medium (CVSS 6.0): A flaw was found in chrony versions before 3.5.1 when creating the PID file under the /var/run/chrony folder. The file…
CVE-2012-4502 — Medium (CVSS 5.0): Multiple integer overflows in pktlength.c in Chrony before 1.29 allow remote attackers to cause a denial of service…

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