// For flags

CVE-2021-3773

kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
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

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2021-09-06 CVE Reserved
  • 2022-02-16 CVE Published
  • 2024-07-18 First Exploit
  • 2024-08-03 CVE Updated
  • 2024-08-27 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CAPEC
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
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
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
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
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
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
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