CVE-2011-4528
Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2011-4528- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-399
- Updated
- 2026-11-02
CVE ListNo score
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.
- Record
CVE-2011-4528- Updated
- 2026-11-02
EUVDEUVD-2011-4454No score
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.
- Record
EUVD-2011-4454- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-q376-m379-55x8No score
Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME...
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.
- Record
GHSA-q376-m379-55x8- Updated
- 2026-11-02
OSVNo score
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.
- Record
CVE-2011-4528- Updated
- 2026-11-02
OSVDEBIAN-CVE-2011-4528No score
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.
- Record
DEBIAN-CVE-2011-4528- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
unboundDebian:12 | before 1.4.14-1 | 1.4.14-1 |
unboundDebian:13 | before 1.4.14-1 | 1.4.14-1 |
unboundDebian:14 | before 1.4.14-1 | 1.4.14-1 |
unboundDebian:5.0 From an advisory covering 2 CVEs | before 1.4.6-1~lenny2, plus listed versions 1.0.2-11.0.2-1+lenny11.0.2-1.11.0.2-1.21.2.1-1 Show 16 moreShow less1.2.1-1~bpo40+11.2.1-21.3.0-11.3.2-11.3.3-11.3.4-11.4.0-11.4.1-11.4.1-21.4.2-11.4.3-11.4.4-11.4.5-11.4.5-1~bpo50+11.4.6-1~bpo50+11.4.6-1~lenny1 | 1.4.6-1~lenny2 |
unboundDebian:6.0 From an advisory covering 2 CVEs | before 1.4.6-1+squeeze2, plus listed versions 1.4.6-1 | 1.4.6-1+squeeze2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2011-4528 is a medium vulnerability (CVSS 5.0) in Unbound, published December 20, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.84%, the 86th percentile. Fixed in unbound 1.4.14-1.