CVE-2021-3773
kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
1Exploited in Wild
-Decision
Descriptions
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
Un fallo en netfilter podría permitir a un atacante conectado a la red inferir información del endpoint de la conexión openvpn para su posterior uso en ataques de red tradicionales
Red Hat Advanced Cluster Management for Kubernetes 2.5.0 images Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. This advisory contains the container images for Red Hat Advanced Cluster Management for Kubernetes, which fix several bugs and security issues. Issues addressed include privilege escalation and traversal vulnerabilities.
CVSS Scores
SSVC
- Decision:Attend
Timeline
- 2021-09-06 CVE Reserved
- 2022-02-16 CVE Published
- 2024-07-18 First Exploit
- 2025-03-28 CVE Updated
- 2025-05-12 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CAPEC
References (5)
| URL | Tag | Source |
|---|---|---|
| https://citizenlab.ca/2024/07/vulnerabilities-in-vpns-paper-presented-at-the-privacy-enhancing-technologies-symposium-2024 |
| URL | Date | SRC |
|---|---|---|
| https://github.com/d0rb/CVE-2021-3773 | 2024-07-18 |
| URL | Date | SRC |
|---|---|---|
| https://www.oracle.com/security-alerts/cpujul2022.html | 2023-02-24 |
| URL | Date | SRC |
|---|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=2004949 | 2022-05-10 | |
| https://access.redhat.com/security/cve/CVE-2021-3773 | 2022-05-10 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.14 Search vendor "Linux" for product "Linux Kernel" and version " < 5.14" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.15 < 5.15.15 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 5.15.15" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 34 Search vendor "Fedoraproject" for product "Fedora" and version "34" | - |
Affected
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| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 6.0 Search vendor "Redhat" for product "Enterprise Linux" and version "6.0" | - |
Affected
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| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 7.0 Search vendor "Redhat" for product "Enterprise Linux" and version "7.0" | - |
Affected
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| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0" | - |
Affected
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| Oracle Search vendor "Oracle" | Communications Cloud Native Core Binding Support Function Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function" | 22.1.3 Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function" and version "22.1.3" | - |
Affected
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| Oracle Search vendor "Oracle" | Communications Cloud Native Core Network Exposure Function Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function" | 22.1.1 Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function" and version "22.1.1" | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Communications Cloud Native Core Policy Search vendor "Oracle" for product "Communications Cloud Native Core Policy" | 22.2.0 Search vendor "Oracle" for product "Communications Cloud Native Core Policy" and version "22.2.0" | - |
Affected
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