Vulnerability Details : CVE-2021-1356
Multiple vulnerabilities in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker with read-only privileges to cause the web UI software to become unresponsive and consume vty line instances, resulting in a denial of service (DoS) condition. These vulnerabilities are due to insufficient error handling in the web UI. An attacker could exploit these vulnerabilities by sending crafted HTTP packets to an affected device. A successful exploit could allow the attacker to cause the web UI software to become unresponsive and consume all available vty lines, preventing new session establishment and resulting in a DoS condition. Manual intervention would be required to regain web UI and vty session functionality. Note: These vulnerabilities do not affect the console connection.
Vulnerability category: Input validationDenial of service
Products affected by CVE-2021-1356
- cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.1.1a:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.1.2:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.15.1xbs:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.15.2xbs:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-1356
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 39 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-1356
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
3.5
|
LOW | AV:N/AC:M/Au:S/C:N/I:N/A:P |
6.8
|
2.9
|
NIST | |
4.3
|
MEDIUM | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
2.8
|
1.4
|
Cisco Systems, Inc. | |
4.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
2.8
|
1.4
|
NIST |
CWE ids for CVE-2021-1356
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: ykramarz@cisco.com (Secondary)
-
The product does not handle or incorrectly handles an exceptional condition.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-1356
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-z9yqYQAn
Cisco IOS XE Software Web UI Denial of Service VulnerabilitiesVendor Advisory
Jump to