Vulnerability Details : CVE-2022-20812
Multiple vulnerabilities in the API and in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow a remote attacker to overwrite arbitrary files or conduct null byte poisoning attacks on an affected device. Note: Cisco Expressway Series refers to the Expressway Control (Expressway-C) device and the Expressway Edge (Expressway-E) device. For more information about these vulnerabilities, see the Details section of this advisory.
Vulnerability category: Directory traversal
Exploit prediction scoring system (EPSS) score for CVE-2022-20812
Probability of exploitation activity in the next 30 days: 0.12%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 46 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2022-20812
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
8.5
|
HIGH | AV:N/AC:L/Au:S/C:N/I:C/A:C |
8.0
|
9.2
|
NIST |
|
9.0
|
CRITICAL | CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L |
2.3
|
6.0
|
Cisco Systems, Inc. |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H |
1.2
|
5.2
|
NIST |
CWE ids for CVE-2022-20812
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by: nvd@nist.gov (Primary)
-
The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component.Assigned by: ykramarz@cisco.com (Secondary)
References for CVE-2022-20812
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-expressway-csrf-sqpsSfY6
Cisco Expressway Series and Cisco TelePresence Video Communication Server VulnerabilitiesVendor Advisory
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-expressway-overwrite-3buqW8LH
Cisco Expressway Series and Cisco TelePresence Video Communication Server VulnerabilitiesVendor Advisory
Products affected by CVE-2022-20812
- cpe:2.3:a:cisco:telepresence_video_communication_server:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:expressway:*:*:*:*:*:*:*:*