Critical severity9.8NVD Advisory· Published Feb 16, 2022· Updated Jun 17, 2026
CVE-2021-3773
CVE-2021-3773
Description
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
30- netfilter/netfilterdescription
- osv-coords20 versionspkg:rpm/almalinux/bpftoolpkg:rpm/almalinux/kernelpkg:rpm/almalinux/kernel-abi-stablelistspkg:rpm/almalinux/kernel-corepkg:rpm/almalinux/kernel-cross-headerspkg:rpm/almalinux/kernel-debugpkg:rpm/almalinux/kernel-debug-corepkg:rpm/almalinux/kernel-debug-develpkg:rpm/almalinux/kernel-debug-modulespkg:rpm/almalinux/kernel-debug-modules-extrapkg:rpm/almalinux/kernel-develpkg:rpm/almalinux/kernel-headerspkg:rpm/almalinux/kernel-modulespkg:rpm/almalinux/kernel-modules-extrapkg:rpm/almalinux/kernel-toolspkg:rpm/almalinux/kernel-tools-libspkg:rpm/almalinux/kernel-tools-libs-develpkg:rpm/almalinux/perfpkg:rpm/almalinux/python3-perfpkg:rpm/almalinux/kernel-doc
< 4.18.0-372.9.1.el8+ 19 more
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- (no CPE)range: < 4.18.0-372.9.1.el8
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
4- www.oracle.com/security-alerts/cpujul2022.htmlnvdPatchThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
- citizenlab.ca/2024/07/vulnerabilities-in-vpns-paper-presented-at-the-privacy-enhancing-technologies-symposium-2024/nvd
- security.netapp.com/advisory/ntap-20250328-0004/nvd
News mentions
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