According to the version of the unbound packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - 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.(CVE-2019-16866)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Fix build on rhel/centos systems

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

CVE-2019-16866

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the unbound packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - NLnet Labs Unbound, up to and including version 1.12.0,     and NLnet Labs NSD, up to and including version 4.3.3,     contain a local vulnerability that would allow for a     local symlink attack. When writing the PID file,     Unbound and NSD create the file if it is not there, or     open an existing file for writing. In case the file was     already present, they would follow symlinks if the file     happened to be a symlink instead of a regular file. An     additional chown of the file would then take place     after it was written, making the user Unbound/NSD is     supposed to run as the new owner of the file. If an     attacker has local access to the user Unbound/NSD runs     as, she could create a symlink in place of the PID file     pointing to a file that she would like to erase. If     then Unbound/NSD is killed and the PID file is not     cleared, upon restarting with root privileges,     Unbound/NSD will rewrite any file pointed at by the     symlink. This is a local vulnerability that could     create a Denial of Service of the system Unbound/NSD is     running on. It requires an attacker having access to     the limited permission user Unbound/NSD runs as and     point through the symlink to a critical file on the     system.(CVE-2020-28935)

  - 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.(CVE-2019-16866)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

X41 D-Sec discovered that unbound, a validating, recursive, and caching DNS resolver, did not correctly process some NOTIFY queries.
This could lead to remote denial-of-service by application crash.

Unbound Security Advisories :

Due to an error in parsing NOTIFY queries, it is possible for Unbound to continue processing malformed queries and may ultimately result in a pointer dereference in uninitialized memory. This results in a crash of the Unbound daemon.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch 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.
    (CVE-2019-16866)

Note that Nessus relies on the presence of the package as reported by the vendor.

It was discovered that Unbound incorrectly handled certain NOTIFY queries. An attacker could possibly use this issue to cause a denial of service.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update of the unbound package has been released.

According to the version of the unbound package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - 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.(CVE-2019-16866)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Published	Updated	Severity
142249	EulerOS 2.0 SP9 : unbound (EulerOS-SA-2020-2423)	Nessus	Huawei Local Security Checks	11/3/2020	2/12/2024	high
130804	Fedora 30 : unbound (2019-e99b716a92)	Nessus	Fedora Local Security Checks	11/12/2019	4/12/2024	high
130775	Fedora 31 : unbound (2019-0418c12a36)	Nessus	Fedora Local Security Checks	11/12/2019	4/12/2024	high
147670	EulerOS Virtualization 2.9.0 : unbound (EulerOS-SA-2021-1634)	Nessus	Huawei Local Security Checks	3/11/2021	1/10/2024	high
142323	EulerOS 2.0 SP9 : unbound (EulerOS-SA-2020-2441)	Nessus	Huawei Local Security Checks	11/3/2020	2/12/2024	high
129985	Debian DSA-4544-1 : unbound - security update	Nessus	Debian Local Security Checks	10/17/2019	4/18/2024	high
129573	FreeBSD : unbound -- parsing vulnerability (108a4be3-e612-11e9-9963-5f1753e0aca0)	Nessus	FreeBSD Local Security Checks	10/4/2019	4/19/2024	high
147617	EulerOS Virtualization 2.9.1 : unbound (EulerOS-SA-2021-1629)	Nessus	Huawei Local Security Checks	3/10/2021	1/10/2024	high
222458	Linux Distros Unpatched Vulnerability : CVE-2019-16866	Nessus	Misc.	3/4/2025	9/5/2025	high
129749	Ubuntu 19.04 : unbound vulnerability (USN-4149-1)	Nessus	Ubuntu Local Security Checks	10/9/2019	4/18/2024	high
130106	Photon OS 3.0: Unbound PHSA-2019-3.0-0035	Nessus	PhotonOS Local Security Checks	10/22/2019	8/22/2025	high
139989	EulerOS 2.0 SP8 : unbound (EulerOS-SA-2020-1886)	Nessus	Huawei Local Security Checks	8/28/2020	2/22/2024	high
140969	EulerOS Virtualization for ARM 64 3.0.6.0 : unbound (EulerOS-SA-2020-2021)	Nessus	Huawei Local Security Checks	9/29/2020	2/19/2024	high

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