CVE-2021-3773
published 2022-02-16CVE-2021-3773: A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
PriorityP356critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
5.28%
91.7th percentile
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| fedoraproject | fedora | — | — |
| linux | linux_kernel | < 5.14 | 5.14 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.15 < 5.15.15 | 5.15.15 |
| msrc | cm1_kernel_5.10.189.1-1_on_cbl_mariner_1.0 | — | — |
| oracle | communications_cloud_native_core_binding_support_function | — | — |
| oracle | communications_cloud_native_core_network_exposure_function | — | — |
| oracle | communications_cloud_native_core_policy | — | — |
| paloalto | pan-os | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.07.5HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
osv9.8CRITICAL
vendor_msrc9.8CRITICAL
vendor_oracle9.8CRITICAL
vendor_redhat9.8CRITICAL
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Palo Alto
PAN-SA-2024-0001 Informational Bulletin: Impact of OSS CVEs in PAN-OS
vendor_paloalto·2024-02-14·CVSS 9.8
CVE-2017-18342 [CRITICAL] PAN-SA-2024-0001 Informational Bulletin: Impact of OSS CVEs in PAN-OS
PAN-SA-2024-0001 Informational Bulletin: Impact of OSS CVEs in PAN-OS
The Palo Alto Networks Product Security Assurance team has evaluated the following open source software (OSS) CVEs as they relate to PAN-OS software. While PAN-OS software may include the
CVEs: CVE-2017-18342, CVE-2017-8923, CVE-2017-9120, CVE-2019-1551, CVE-2019-16865, CVE-2019-16905, CVE-2019-19523, CVE-2019-19528, CVE-2019-19911, CVE-2020-0404, CVE-2020-0431, CVE-2020-0466, CVE-2020-10379, CVE-2020-11538, CVE-2020-11608, CVE-2020-12114, CVE-2020-12321, CVE-2020-12362, CVE-2020-12363, CVE-2020-12364, CVE-2020-13757, CVE-2020-14314, CVE-2020-14351, CVE-2020-15778, CVE-2020-1967, CVE-2020-24394, CVE-2020-24504, CVE-2020-25211, CVE-2020-25212, CVE-2020-25284, CVE-2020-25285, CVE-2020-25717, CVE-2020-26541, CVE-2020-2715
Microsoft
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
vendor_msrc·2022-02-08·CVSS 9.8
CVE-2021-3773 [CRITICAL] CWE-200 A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
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Red Hat
kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients
vendor_redhat·2021-09-08·CVSS 9.8
CVE-2021-3773 [CRITICAL] CWE-200 kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients
kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
Mitigation: Mitigation for this issue is either not available or the currently available options does not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Package: kernel (Red Hat Enterprise Linux 6) - Out of support scope
Package: kernel (Red Hat Enterprise Linux 7) - Out of support scope
Oracle
Oracle Oracle Financial Services Applications Risk Matrix: Order Management (Spring Web Services) — CVE-2019-3773
vendor_oracle·2021-04-15·CVSS 9.8
CVE-2019-3773 [CRITICAL] Oracle Oracle Financial Services Applications Risk Matrix: Order Management (Spring Web Services) — CVE-2019-3773
Oracle Oracle Financial Services Applications Risk Matrix: Order Management (Spring Web Services) vulnerability
CVE: CVE-2019-3773
CVSS: 9.8
Protocol: HTTP
Remote exploit: Yes
Affected versions: Network
Advisory: cpuapr2021 (APR 2021)
Oracle
Oracle Oracle Financial Services Applications Risk Matrix: Infrastructure (Spring Web Services) — CVE-2019-3773
vendor_oracle·2021-01-15·CVSS 9.8
CVE-2019-3773 [CRITICAL] Oracle Oracle Financial Services Applications Risk Matrix: Infrastructure (Spring Web Services) — CVE-2019-3773
Oracle Oracle Financial Services Applications Risk Matrix: Infrastructure (Spring Web Services) vulnerability
CVE: CVE-2019-3773
CVSS: 9.8
Protocol: HTTP
Remote exploit: Yes
Affected versions: Network
Advisory: cpujan2021 (JAN 2021)
GHSA
GHSA-3xjv-m925-6jcj: A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network a
ghsa_unreviewed·2022-02-17
CVE-2021-3773 [CRITICAL] CWE-200 GHSA-3xjv-m925-6jcj: A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network a
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
OSV
CVE-2021-3773: A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network a
osv·2022-02-16·CVSS 9.8
CVE-2021-3773 [CRITICAL] CVE-2021-3773: A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network a
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://bugzilla.redhat.com/show_bug.cgi?id=2004949https://citizenlab.ca/2024/07/vulnerabilities-in-vpns-paper-presented-at-the-privacy-enhancing-technologies-symposium-2024/https://www.oracle.com/security-alerts/cpujul2022.htmlhttps://bugzilla.redhat.com/show_bug.cgi?id=2004949https://citizenlab.ca/2024/07/vulnerabilities-in-vpns-paper-presented-at-the-privacy-enhancing-technologies-symposium-2024/https://security.netapp.com/advisory/ntap-20250328-0004/https://www.oracle.com/security-alerts/cpujul2022.html
2022-02-16
Published