Detections
Analytics
Linux Distros Unpatched Vulnerability : CVE-2021-3716
low Nessus Plugin ID 224044
Language:
Synopsis
The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.Description
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 nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability. (CVE-2021-3716)
Note that Nessus relies on the presence of the package as reported by the vendor.
Solution
There is no known solution at this time.See Also
https://access.redhat.com/security/cve/cve-2021-3716
Plugin Details
Severity: Low
ID: 224044
File Name: unpatched_CVE_2021_3716.nasl
Version: 1.11
Type: Local
Agent: unix
Family: Misc.
Published: 3/5/2025
Updated: 6/21/2026
Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 1.2
Percentile: 0.01
CVSS v2
Risk Factor: Low
Base Score: 3.5
Temporal Score: 3
Vector: CVSS2#AV:N/AC:M/Au:S/C:N/I:N/A:P
CVSS Score Source: CVE-2021-3716
CVSS v3
Risk Factor: Low
Base Score: 3.1
Temporal Score: 2.9
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
Vulnerability Information
CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:redhat:enterprise_linux:8, cpe:/a:redhat:advanced_virtualization:8::el8, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:centos:centos:nbdkit, p-cpe:/a:centos:centos:nbdkit-basic-plugins, p-cpe:/a:centos:centos:nbdkit-devel, p-cpe:/a:centos:centos:nbdkit-example-plugins, p-cpe:/a:centos:centos:nbdkit-plugin-python-common, p-cpe:/a:centos:centos:nbdkit-plugin-vddk, p-cpe:/a:redhat:enterprise_linux:nbdkit, p-cpe:/a:redhat:enterprise_linux:nbdkit-bash-completion, p-cpe:/a:redhat:enterprise_linux:nbdkit-basic-plugins, p-cpe:/a:redhat:enterprise_linux:nbdkit-devel, p-cpe:/a:redhat:enterprise_linux:nbdkit-example-plugins, p-cpe:/a:redhat:enterprise_linux:nbdkit-plugin-gzip, p-cpe:/a:redhat:enterprise_linux:nbdkit-plugin-python-common, p-cpe:/a:redhat:enterprise_linux:nbdkit-plugin-python3, p-cpe:/a:redhat:enterprise_linux:nbdkit-plugin-vddk, p-cpe:/a:redhat:enterprise_linux:nbdkit-plugin-xz, p-cpe:/a:redhat:enterprise_linux:nbdkit-basic-filters, p-cpe:/a:redhat:enterprise_linux:nbdkit-curl-plugin, p-cpe:/a:redhat:enterprise_linux:nbdkit-gzip-plugin, p-cpe:/a:redhat:enterprise_linux:nbdkit-linuxdisk-plugin, p-cpe:/a:redhat:enterprise_linux:nbdkit-python-plugin, p-cpe:/a:redhat:enterprise_linux:nbdkit-server, p-cpe:/a:redhat:enterprise_linux:nbdkit-ssh-plugin, p-cpe:/a:redhat:enterprise_linux:nbdkit-vddk-plugin, p-cpe:/a:redhat:enterprise_linux:nbdkit-xz-filter, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:nbdkit-bash-completion, p-cpe:/a:centos:centos:nbdkit-plugin-gzip, p-cpe:/a:centos:centos:nbdkit-plugin-python3, p-cpe:/a:centos:centos:nbdkit-plugin-xz, p-cpe:/a:centos:centos:nbdkit-basic-filters, p-cpe:/a:centos:centos:nbdkit-curl-plugin, p-cpe:/a:centos:centos:nbdkit-gzip-plugin, p-cpe:/a:centos:centos:nbdkit-linuxdisk-plugin, p-cpe:/a:centos:centos:nbdkit-python-plugin, p-cpe:/a:centos:centos:nbdkit-server, p-cpe:/a:centos:centos:nbdkit-ssh-plugin, p-cpe:/a:centos:centos:nbdkit-vddk-plugin, p-cpe:/a:centos:centos:nbdkit-xz-filter, p-cpe:/a:redhat:enterprise_linux:nbdkit-gzip-filter, p-cpe:/a:redhat:enterprise_linux:nbdkit-nbd-plugin, p-cpe:/a:redhat:enterprise_linux:nbdkit-tar-filter, p-cpe:/a:redhat:enterprise_linux:nbdkit-tar-plugin, p-cpe:/a:redhat:enterprise_linux:nbdkit-tmpdisk-plugin, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:centos:centos:nbdkit-gzip-filter, p-cpe:/a:centos:centos:nbdkit-nbd-plugin, p-cpe:/a:centos:centos:nbdkit-tar-filter, p-cpe:/a:centos:centos:nbdkit-tar-plugin, p-cpe:/a:centos:centos:nbdkit-tmpdisk-plugin, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:debian:debian_linux:nbdkit, cpe:/o:canonical:ubuntu_linux:25.04, p-cpe:/a:canonical:ubuntu_linux:nbdkit, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:26.04:-:lts
Required KB Items: Host/OS/identifier, Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 2/2/2022
Reference Information
CVE: CVE-2021-3716