A vulnerability in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to inject arbitrary commands that can be executed as the root user. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted request to the web UI of an affected device with arbitrary commands injected into a portion of the request. A successful exploit could allow the attacker to execute arbitrary commands as the root user.
Published 2021-03-24 20:15:15
Updated 2021-03-29 20:03:09
View at NVD,   CVE.org
Vulnerability category: Directory traversal

CVE-2021-1435 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:
Cisco IOS XE Web UI Command Injection Vulnerability
CISA required action:
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA description:
Cisco IOS XE contains a command injection vulnerability in the web user interface that could allow a remote, authenticated attacker to inject commands that can be executed as the root user.
Notes:
https://blog.talosintelligence.com/active-exploitation-of-cisco-ios-xe-software/
Added on 2023-10-19 Action due date 2023-10-25

Exploit prediction scoring system (EPSS) score for CVE-2021-1435

0.17%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 53 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-1435

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
9.0
HIGH AV:N/AC:L/Au:S/C:C/I:C/A:C
8.0
10.0
NIST
6.6
MEDIUM CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
0.7
5.9
Cisco Systems, Inc.
7.2
HIGH CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
1.2
5.9
NIST

CWE ids for CVE-2021-1435

  • 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: ykramarz@cisco.com (Primary)

References for CVE-2021-1435

Products affected by CVE-2021-1435

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