chrony: Heap out of bound write in address filter
Published Apr 16, 2015
6.5
MEDIUMCVSS 2.0
EPSS 3.41%
Description
Heap-based buffer overflow in chrony before 1.31.1 allows remote authenticated users to cause a denial of service (chronyd crash) or possibly execute arbitrary code by configuring the (1) NTP or (2) cmdmon access with a subnet size that is indivisible by four and an address with a nonzero bit in the subnet remainder.
Affected products
No data.
Configuration 2
- 7.0
No data.
Red Hat Enterprise Linux 7
chrony-0:2.1.1-1.el7
Fixed · RHSA-2015:2241
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | chrony-0:2.1.1-1.el7 | Fixed | RHSA-2015:2241 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:S/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 3.41% (0.03414) | 88.50th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.44% (0.03439) | 87.39th | v5 (v2026.06.15) |
| May 10, 2025 | 2.60% (0.02605) | 84.80th | v4 (v2025.03.14) |
| Mar 30, 2025 | 3.94% (0.03937) | 87.26th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.53% (0.06531) | 84.79th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.94% (0.03937) | 87.56th | v4 (v2025.03.14) |
| Dec 17, 2024 | 0.93% (0.00934) | 82.80th | v3 (v2023.03.01) |
| May 16, 2023 | 2.75% (0.02746) | 89.02th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.69% (0.02685) | 88.79th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.94% (0.03941) | 85.90th | v2 (v2022.01.01) |
| Feb 13, 2023 | 3.94% (0.03941) | 85.50th | v2 (v2022.01.01) |
| Feb 3, 2023 | 3.01% (0.03006) | 83.19th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.94% (0.03941) | 84.45th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.94% (0.03941) | 67.71th | v2 (v2022.01.01) |
References (9)
- http://listengine.tuxfamily.org/chrony.tuxfamily.org/chrony-announce/2015/04/msg00002.html mailing-listx_refsource_MLISTPatchVendor Advisory
- http://www.debian.org/security/2015/dsa-3222 vendor-advisoryx_refsource_DEBIAN
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/73955 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2015-1821 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1209631 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-1821
- https://security.gentoo.org/glsa/201507-01 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2015-1821
| Link | Providers | Tags |
|---|---|---|
| http://listengine.tuxfamily.org/chrony.tuxfamily.org/chrony-announce/2015/04/msg00002.html | mailing-listx_refsource_MLISTPatchVendor Advisory | |
| http://www.debian.org/security/2015/dsa-3222 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html | x_refsource_CONFIRM | |
| http://www.securityfocus.com/bid/73955 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2015-1821 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1209631 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-1821 | ||
| https://security.gentoo.org/glsa/201507-01 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2015-1821 |
Change history (0)
No recorded changes yet.