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Vulnerability · Published Feb 16, 2022 · Assigned by redhat

CVE-2021-3773

Critical 9.8

In plain English

A critical-severity information exposure in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 5.3% (higher than 93% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)5.3%top 7.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-abi-stablelists4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-core4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-cross-headers4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-debug4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-debug-core4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-debug-devel4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-debug-modules4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-debug-modules-extra4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-devel4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-doc4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-headers4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-modules4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-modules-extra4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-tools4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-tools-libs4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8kernel-tools-libs-devel4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8perf4.18.0-372.9.1.el8ALSA-2022:1988
AlmaLinux:8python3-perf4.18.0-372.9.1.el8ALSA-2022:1988
Rocky Linux:8kernel0:4.18.0-372.9.1.el8RLSA-2022:1988
Rocky Linux:8kernel-rt0:4.18.0-372.9.1.rt7.166.el8RLSA-2022:1975
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-3773
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2021-3773
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2021-3773
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2021-3773

Affected products (as reported)

VendorProductVersions
n/a kernel kernel 5.14.0-49.el9, kernel 5.15.15-100.fc34, kernel 5.15.15-200.fc35

Weakness: CWE-200

References