Vulnerability Name:

CVE-2021-3824 (CCN-209995)

Assigned:2021-09-23
Published:2021-09-23
Updated:2021-09-29
Summary:OpenVPN Access Server 2.9.0 through 2.9.4 allow remote attackers to inject arbitrary web script or HTML via the web login page URL.
CVSS v3 Severity:6.1 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
5.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): None
6.1 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
5.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
5.5 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-79
Vulnerability Consequences:Cross-Site Scripting
References:Source: MITRE
Type: CNA
CVE-2021-3824

Source: XF
Type: UNKNOWN
openvpn-cve20213824-xss(209995)

Source: CCN
Type: OpenVPN Web site
OpenVPN Access Server 2.9.5

Source: MISC
Type: Release Notes, Vendor Advisory
https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-9-5

Vulnerable Configuration:Configuration 1:
  • cpe:/a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:* (Version >= 2.9.0 and <= 2.9.4)

    • Configuration CCN 1:
  • cpe:/a:openvpn:openvpn_access_server:2.9.0:*:*:*:*:*:*:*
  • OR cpe:/a:openvpn:openvpn_access_server:2.9.1:*:*:*:*:*:*:*
  • OR cpe:/a:openvpn:openvpn_access_server:2.9.2:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    openvpn openvpn access server *
    openvpn openvpn access server 2.9.0
    openvpn openvpn access server 2.9.1
    openvpn openvpn access server 2.9.2