| Vulnerability Name: | CVE-2021-3773 (CCN-208913) |
| Assigned: | 2021-09-08 |
| Published: | 2021-09-08 |
| Updated: | 2023-02-24 |
| Summary: | A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks. |
| CVSS v3 Severity: | 9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.6 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:R)| Exploitability Metrics: | Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None | | Scope: | Scope (S): Unchanged
| | Impact Metrics: | Confidentiality (C): High
Integrity (I): High
Availibility (A): High |
7.7 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H)
6.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H/E:U/RL:U/RC:R)| Exploitability Metrics: | Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None | | Scope: | Scope (S): Unchanged
| | Impact Metrics: | Confidentiality (C): Low
Integrity (I): High
Availibility (A): High |
5.9 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
5.2 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:R)| Exploitability Metrics: | Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None | | Scope: | Scope (S): Unchanged
| | Impact Metrics: | Confidentiality (C): High
Integrity (I): None
Availibility (A): None |
|
| CVSS v2 Severity: | 7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)| Exploitability Metrics: | Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None | | Impact Metrics: | Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial |
7.3 High (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:P/I:C/A:C)| Exploitability Metrics: | Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): None
| | Impact Metrics: | Confidentiality (C): Partial
Integrity (I): Complete
Availibility (A): Complete |
|
| Vulnerability Type: | CWE-200
|
| Vulnerability Consequences: | Denial of Service |
| References: | Source: MITRE
Type: CNA
CVE-2021-3773
Source: secalert@redhat.com
Type: Issue Tracking, Third Party Advisory
secalert@redhat.com
Source: XF
Type: UNKNOWN
openvpn-cve20213773-dos(208913)
Source: CCN
Type: OpenVPN Web site
OpenVPN
Source: CCN
Type: oss-sec Mailing List, Wed, 8 Sep 2021 14:37:17 -0400
CVE-2021-3773: Lack of port sanity checking in natd and Netfilter leads to exploit of OpenVPN clients on Linux and FreeBSD platforms
Source: secalert@redhat.com
Type: Patch, Third Party Advisory
secalert@redhat.com
|
| Vulnerable Configuration: | Configuration RedHat 1:
cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*Configuration RedHat 2:
cpe:/a:redhat:enterprise_linux:8::nfv:*:*:*:*:*Configuration RedHat 3:
cpe:/a:redhat:enterprise_linux:8::realtime:*:*:*:*:*Configuration RedHat 4:
cpe:/a:redhat:enterprise_linux:8::crb:*:*:*:*:*Configuration RedHat 5:
cpe:/o:redhat:enterprise_linux:8:*:*:*:*:*:*:*Configuration RedHat 6:
cpe:/o:redhat:enterprise_linux:8::baseos:*:*:*:*:*
Configuration CCN 1:
cpe:/a:openvpn:openvpn:2.4.4:*:*:*:*:*:*:*
 Denotes that component is vulnerable |
| Oval Definitions |
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