CVE-2021-1434: Cisco IOS XE SD-WAN Software Arbitrary File Corruption Vulnerability
First published: Wed Mar 24 2021(Updated: )
A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to overwrite arbitrary files in the underlying file system. This vulnerability is due to insufficient validation of the parameters of a specific CLI command. An attacker could exploit this vulnerability by issuing that command with specific parameters. A successful exploit could allow the attacker to overwrite the content of any arbitrary file that resides on the underlying host file system.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE Web UI | =16.11.1 | |
| Cisco IOS XE Web UI | =16.11.1a | |
| Cisco IOS XE Web UI | =16.11.1b | |
| Cisco IOS XE Web UI | =16.11.1c | |
| Cisco IOS XE Web UI | =16.11.1s | |
| Cisco IOS XE Web UI | =16.11.2 | |
| Cisco IOS XE Web UI | =16.12.1 | |
| Cisco IOS XE Web UI | =16.12.1a | |
| Cisco IOS XE Web UI | =16.12.1c | |
| Cisco IOS XE Web UI | =16.12.1s | |
| Cisco IOS XE Web UI | =16.12.1t | |
| Cisco IOS XE Web UI | =16.12.1w | |
| Cisco IOS XE Web UI | =16.12.1x | |
| Cisco IOS XE Web UI | =16.12.1y | |
| Cisco IOS XE Web UI | =16.12.1z | |
| Cisco IOS XE Web UI | =16.12.1za | |
| Cisco IOS XE Web UI | =16.12.2 | |
| Cisco IOS XE Web UI | =16.12.2a | |
| Cisco IOS XE Web UI | =16.12.2s | |
| Cisco IOS XE Web UI | =16.12.2t | |
| Cisco IOS XE Web UI | =16.12.3 | |
| Cisco IOS XE Web UI | =16.12.3a | |
| Cisco IOS XE Web UI | =16.12.3s | |
| Cisco IOS XE Web UI | =17.2.1 | |
| Cisco IOS XE Web UI | =17.2.1a | |
| Cisco IOS XE Web UI | =17.2.1r | |
| Cisco IOS XE Web UI | =17.2.1v |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-1434?
CVE-2021-1434 has a medium severity rating due to its ability to allow authenticated local attackers to overwrite arbitrary files.
How do I fix CVE-2021-1434?
To fix CVE-2021-1434, you need to upgrade Cisco IOS XE to a version where the vulnerability has been patched.
Which Cisco IOS XE versions are affected by CVE-2021-1434?
CVE-2021-1434 affects Cisco IOS XE versions 16.11.1, 16.11.1a, 16.11.1b, 16.11.1c, 16.11.1s, 16.12.1 through 16.12.3, and 17.2.1 series.
What type of attack can exploit CVE-2021-1434?
CVE-2021-1434 can be exploited by an authenticated local attacker to overwrite files on the underlying file system.
Is remote access required to exploit CVE-2021-1434?
No, CVE-2021-1434 does not require remote access as it can be exploited by an authenticated local attacker.
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