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CVE-2019-16866

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a...

7.5 HighFix available

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

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

3.51%Up 1.4 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

Record
CVE-2019-16866
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
Weakness
CWE-755, CWE-908
Updated
2026-11-02
CVE List No score

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

Record
CVE-2019-16866
Updated
2026-11-02
EUVDEUVD-2019-7375 No score

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

Record
EUVD-2019-7375
Updated
2026-11-02
GitHub AdvisoriesGHSA-gg25-v243-f7cq 7.5

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a...

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

Record
GHSA-gg25-v243-f7cq
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-755
Updated
2026-11-02
OSVALPINE-CVE-2019-16866 7.5

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

Record
ALPINE-CVE-2019-16866
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

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

Record
CVE-2019-16866
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
OSVDEBIAN-CVE-2019-16866 7.5

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

Record
DEBIAN-CVE-2019-16866
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-2019-0317 No score

Updated unbound packages fix security vulnerability

Updated unbound packages fix security vulnerability:

Versions before 1.9.4 allow accesses to uninitialized memory, which would permit remote attackers to trigger a crash (CVE-2019-16866).

Record
MGASA-2019-0317
Updated
2026-11-02
OSVopenSUSE-SU-2024:11005-1 No score

libunbound8-1.13.2-1.2 on GA media

These are all security issues fixed in the libunbound8-1.13.2-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11005-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
unbound
Alpine:v3.10
 before 1.9.1-r3
1.9.1-r3
unbound
Alpine:v3.11
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.12
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.13
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.14
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.15
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.16
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.17
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.18
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.19
 before 1.9.4-r0
1.9.4-r0
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Affected packages
PackageAffectedFixed
unbound
Alpine:v3.20
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.21
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.22
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.23
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.24
 before 1.9.4-r0
1.9.4-r0
unbound
Alpine:v3.8
 before 1.7.3-r1
1.7.3-r1
unbound
Alpine:v3.9
 before 1.8.3-r2
1.8.3-r2
unbound
Debian:12
 before 1.9.4-1
1.9.4-1
unbound
Debian:13
 before 1.9.4-1
1.9.4-1
unbound
Debian:14
 before 1.9.4-1
1.9.4-1
unbound
Debian:10
 before 1.9.0-2+deb10u1, plus listed versions
1.9.0-2
1.9.0-2+deb10u1
unbound
Mageia:7
 before 1.9.4-1.mga7
1.9.4-1.mga7
unbound
openSUSE:Tumbleweed
From an advisory covering 6 CVEs
 before 1.13.2-1.2
1.13.2-1.2

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-16866 is a high vulnerability (CVSS 7.5) in Nlnetlabs Unbound, published October 3, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.51%, the 89th percentile. Fixed in unbound 1.9.1-r3.

References

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