Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response
Published Dec 20, 2011
5.0
MEDIUMCVSS 2.0
EPSS 2.84%
Description
Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.
Affected products
No data.
- ≤ 1.4.13
- 0.0
- 0.1
- 0.2
- 0.3
- 0.4
- 0.5
- 0.6
- 0.7
- 0.7.1
- 0.7.2
- 0.8
- 0.09
- 0.10
- 0.11
- 1.0.0
- 1.0.1
- 1.0.2
- 1.1.0
- 1.1.1
- 1.2.0
- 1.2.1
- 1.3.0
- 1.3.1
- 1.3.2
- 1.3.3
- 1.3.4
- 1.4.0
- 1.4.1
- 1.4.2
- 1.4.3
- 1.4.4
- 1.4.5
- 1.4.6
- 1.4.7
- 1.4.8
- 1.4.9
- 1.4.10
- 1.4.11
- 1.4.12
- 1.4.14
No data.
No Red Hat product state for this CVE.
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:N/C:N/I:N/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 1, 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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.84% (0.02838) | 86.16th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.94% (0.02944) | 85.30th | v5 (v2026.06.15) |
| Mar 29, 2025 | 2.78% (0.02781) | 76.73th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.61% (0.01607) | 80.47th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.83% (0.00829) | 82.68th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.83% (0.00829) | 81.41th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.83% (0.00829) | 79.37th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
References (7)
- http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071525.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071535.html vendor-advisoryx_refsource_FEDORA
- http://osvdb.org/77909 vdb-entryx_refsource_OSVDB
- http://secunia.com/advisories/47326 third-party-advisoryx_refsource_SECUNIA
- http://unbound.nlnetlabs.nl/downloads/CVE-2011-4528.txt x_refsource_CONFIRMPatchVendor Advisory
- http://www.debian.org/security/2011/dsa-2370 vendor-advisoryx_refsource_DEBIAN
- http://www.kb.cert.org/vuls/id/209659 third-party-advisoryx_refsource_CERT-VNPatchThird Party AdvisoryUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071525.html | vendor-advisoryx_refsource_FEDORA | |
| http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071535.html | vendor-advisoryx_refsource_FEDORA | |
| http://osvdb.org/77909 | vdb-entryx_refsource_OSVDB | |
| http://secunia.com/advisories/47326 | third-party-advisoryx_refsource_SECUNIA | |
| http://unbound.nlnetlabs.nl/downloads/CVE-2011-4528.txt | x_refsource_CONFIRMPatchVendor Advisory | |
| http://www.debian.org/security/2011/dsa-2370 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.kb.cert.org/vuls/id/209659 | third-party-advisoryx_refsource_CERT-VNPatchThird Party AdvisoryUS Government Resource |
Change history (0)
No recorded changes yet.