The remote CentOS Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the CESA-2021:1791 advisory.

  - spice-vdagent: memory DoS via arbitrary entries in active_xfers hash table (CVE-2020-25650)

  - spice-vdagent: possible file transfer DoS and information leak via active_xfers hash map (CVE-2020-25651)

  - spice-vdagent: possibility to exhaust file descriptors in vdagentd (CVE-2020-25652)

  - spice-vdagent: UNIX domain socket peer PID retrieved via SO_PEERCRED is subject to race condition     (CVE-2020-25653)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ALSA-2021:1791 advisory.

  - A flaw was found in the way the spice-vdagentd daemon handled file transfers from the host system to the     virtual machine. Any unprivileged local guest user with access to the UNIX domain socket path `/run/spice-     vdagentd/spice-vdagent-sock` could use this flaw to perform a memory denial of service for spice-vdagentd     or even other processes in the VM system. The highest threat from this vulnerability is to system     availability. This flaw affects spice-vdagent versions 0.20 and previous versions. (CVE-2020-25650)

  - A flaw was found in the SPICE file transfer protocol. File data from the host system can end up in full or     in parts in the client connection of an illegitimate local user in the VM system. Active file transfers     from other users could also be interrupted, resulting in a denial of service. The highest threat from this     vulnerability is to data confidentiality as well as system availability. This flaw affects spice-vdagent     versions 0.20 and prior. (CVE-2020-25651)

  - A flaw was found in the spice-vdagentd daemon, where it did not properly handle client connections that     can be established via the UNIX domain socket in `/run/spice-vdagentd/spice-vdagent-sock`. Any     unprivileged local guest user could use this flaw to prevent legitimate agents from connecting to the     spice-vdagentd daemon, resulting in a denial of service. The highest threat from this vulnerability is to     system availability. This flaw affects spice-vdagent versions 0.20 and prior. (CVE-2020-25652)

  - A race condition vulnerability was found in the way the spice-vdagentd daemon handled new client     connections. This flaw may allow an unprivileged local guest user to become the active agent for spice-     vdagentd, possibly resulting in a denial of service or information leakage from the host. The highest     threat from this vulnerability is to data confidentiality as well as system availability. This flaw     affects spice-vdagent versions 0.20 and prior. (CVE-2020-25653)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:1791 advisory.

  - A flaw was found in the way the spice-vdagentd daemon handled file transfers from the host system to the     virtual machine. Any unprivileged local guest user with access to the UNIX domain socket path `/run/spice-     vdagentd/spice-vdagent-sock` could use this flaw to perform a memory denial of service for spice-vdagentd     or even other processes in the VM system. The highest threat from this vulnerability is to system     availability. This flaw affects spice-vdagent versions 0.20 and previous versions. (CVE-2020-25650)

  - A flaw was found in the SPICE file transfer protocol. File data from the host system can end up in full or     in parts in the client connection of an illegitimate local user in the VM system. Active file transfers     from other users could also be interrupted, resulting in a denial of service. The highest threat from this     vulnerability is to data confidentiality as well as system availability. This flaw affects spice-vdagent     versions 0.20 and prior. (CVE-2020-25651)

  - A flaw was found in the spice-vdagentd daemon, where it did not properly handle client connections that     can be established via the UNIX domain socket in `/run/spice-vdagentd/spice-vdagent-sock`. Any     unprivileged local guest user could use this flaw to prevent legitimate agents from connecting to the     spice-vdagentd daemon, resulting in a denial of service. The highest threat from this vulnerability is to     system availability. This flaw affects spice-vdagent versions 0.20 and prior. (CVE-2020-25652)

  - A race condition vulnerability was found in the way the spice-vdagentd daemon handled new client     connections. This flaw may allow an unprivileged local guest user to become the active agent for spice-     vdagentd, possibly resulting in a denial of service or information leakage from the host. The highest     threat from this vulnerability is to data confidentiality as well as system availability. This flaw     affects spice-vdagent versions 0.20 and prior. (CVE-2020-25653)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Several vulnerabilities were discovered in spice-vdagent, a spice guest agent for enchancing SPICE integeration and experience.

CVE-2017-15108

spice-vdagent does not properly escape save directory before passing to shell, allowing local attacker with access to the session the agent runs in to inject arbitrary commands to be executed.

CVE-2020-25650

A flaw was found in the way the spice-vdagentd daemon handled file transfers from the host system to the virtual machine. Any unprivileged local guest user with access to the UNIX domain socket path `/run/spice-vdagentd/spice-vdagent-sock` could use this flaw to perform a memory denial of service for spice-vdagentd or even other processes in the VM system. The highest threat from this vulnerability is to system availability. This flaw affects spice-vdagent versions 0.20 and previous versions.

CVE-2020-25651

A flaw was found in the SPICE file transfer protocol. File data from the host system can end up in full or in parts in the client connection of an illegitimate local user in the VM system. Active file transfers from other users could also be interrupted, resulting in a denial of service. The highest threat from this vulnerability is to data confidentiality as well as system availability.

CVE-2020-25652

A flaw was found in the spice-vdagentd daemon, where it did not properly handle client connections that can be established via the UNIX domain socket in `/run/spice-vdagentd/spice-vdagent-sock`. Any unprivileged local guest user could use this flaw to prevent legitimate agents from connecting to the spice-vdagentd daemon, resulting in a denial of service. The highest threat from this vulnerability is to system availability. 

CVE-2020-25653

A race condition vulnerability was found in the way the spice-vdagentd daemon handled new client connections. This flaw may allow an unprivileged local guest user to become the active agent for spice-vdagentd, possibly resulting in a denial of service or information leakage from the host. The highest threat from this vulnerability is to data confidentiality as well as system availability.

For Debian 9 stretch, these problems have been fixed in version 0.17.0-1+deb9u1.

We recommend that you upgrade your spice-vdagent packages.

For the detailed security status of spice-vdagent please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/spice-vdagent

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in the way the spice-vdagentd daemon handled file transfers from the host system to the     virtual machine. Any unprivileged local guest user with access to the UNIX domain socket path `/run/spice-     vdagentd/spice-vdagent-sock` could use this flaw to perform a memory denial of service for spice-vdagentd     or even other processes in the VM system. The highest threat from this vulnerability is to system     availability. This flaw affects spice-vdagent versions 0.20 and previous versions. (CVE-2020-25650)

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

ID	Name	Product	Family	Published	Updated	Severity
149754	CentOS 8 : spice-vdagent (CESA-2021:1791)	Nessus	CentOS Local Security Checks	5/19/2021	12/29/2023	medium
157500	AlmaLinux 8 : spice-vdagent (ALSA-2021:1791)	Nessus	Alma Linux Local Security Checks	2/9/2022	11/13/2023	medium
184744	Rocky Linux 8 : spice-vdagent (RLSA-2021:1791)	Nessus	Rocky Linux Local Security Checks	11/6/2023	11/6/2023	medium
144956	Debian DLA-2524-1 : spice-vdagent security update	Nessus	Debian Local Security Checks	1/14/2021	1/30/2024	high
256827	Linux Distros Unpatched Vulnerability : CVE-2020-25650	Nessus	Misc.	8/27/2025	8/27/2025	medium

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