CVE-2021-1376: Cisco IOS XE Software Fast Reload Vulnerabilities
First published: Wed Mar 24 2021(Updated: )
Multiple vulnerabilities in the fast reload feature of Cisco IOS XE Software running on Cisco Catalyst 3850, Cisco Catalyst 9300, and Cisco Catalyst 9300L Series Switches could allow an authenticated, local attacker to either execute arbitrary code on the underlying operating system, install and boot a malicious software image, or execute unsigned binaries on an affected device. These vulnerabilities are due to improper checks performed by system boot routines. To exploit these vulnerabilities, the attacker would need privileged access to the CLI of the device. A successful exploit could allow the attacker to either execute arbitrary code on the underlying operating system or execute unsigned code and bypass the image verification check part of the secure boot process. For more information about these vulnerabilities, see the Details section of this advisory.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE Software | =16.5.1 | |
| Cisco IOS XE Software | =16.5.1a | |
| Cisco IOS XE Software | =16.6.1 | |
| Cisco IOS XE Software | =16.6.2 | |
| Cisco IOS XE Software | =16.6.3 | |
| Cisco IOS XE Software | =16.6.4 | |
| Cisco IOS XE Software | =16.6.4a | |
| Cisco IOS XE Software | =16.6.4s | |
| Cisco IOS XE Software | =16.6.5 | |
| Cisco IOS XE Software | =16.6.6 | |
| Cisco IOS XE Software | =16.6.7 | |
| Cisco IOS XE Software | =16.6.8 | |
| Cisco IOS XE Software | =16.8.1 | |
| Cisco IOS XE Software | =16.8.1a | |
| Cisco IOS XE Software | =16.8.1s | |
| Cisco IOS XE Software | =16.9.1 | |
| Cisco IOS XE Software | =16.9.1s | |
| Cisco IOS XE Software | =16.9.2 | |
| Cisco IOS XE Software | =16.9.2s | |
| Cisco IOS XE Software | =16.9.3 | |
| Cisco IOS XE Software | =16.9.3a | |
| Cisco IOS XE Software | =16.9.3s | |
| Cisco IOS XE Software | =16.9.4 | |
| Cisco IOS XE Software | =16.9.5 | |
| Cisco IOS XE Software | =16.9.6 | |
| Cisco IOS XE Software | =16.10.1 | |
| Cisco IOS XE Software | =16.10.1e | |
| Cisco IOS XE Software | =16.10.1s | |
| Cisco IOS XE Software | =16.11.1 | |
| Cisco IOS XE Software | =16.11.1b | |
| Cisco IOS XE Software | =16.11.1c | |
| Cisco IOS XE Software | =16.11.1s | |
| Cisco IOS XE Software | =16.11.2 | |
| Cisco IOS XE Software | =16.12.1 | |
| Cisco IOS XE Software | =16.12.1c | |
| Cisco IOS XE Software | =16.12.1s | |
| Cisco IOS XE Software | =16.12.2 | |
| Cisco IOS XE Software | =16.12.2s | |
| Cisco IOS XE Software | =16.12.2t | |
| Cisco IOS XE Software | =16.12.3 | |
| Cisco IOS XE Software | =16.12.3a | |
| Cisco IOS XE Software | =16.12.3s | |
| Cisco IOS XE Software | =16.12.4 | |
| Cisco IOS XE Software | =16.12.4a | |
| Cisco IOS XE Software | =17.1.1 | |
| Cisco IOS XE Software | =17.1.1s | |
| Cisco IOS XE Software | =17.1.1t | |
| Cisco IOS XE Software | =17.1.2 | |
| Cisco IOS XE Software | =17.2.1 | |
| Cisco IOS XE Software | =17.2.1a |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-1376?
CVE-2021-1376 is rated as high severity due to its potential for remote code execution.
How do I fix CVE-2021-1376?
To fix CVE-2021-1376, you should upgrade to a fixed version of Cisco IOS XE Software as recommended in the Cisco advisory.
Which Cisco devices are affected by CVE-2021-1376?
CVE-2021-1376 affects Cisco Catalyst 3850, Catalyst 9300, and Catalyst 9300L Series Switches running vulnerable versions of IOS XE.
What is the potential impact of CVE-2021-1376?
The potential impact of CVE-2021-1376 includes the execution of arbitrary code on the underlying operating system.
Is authentication required to exploit CVE-2021-1376?
Yes, exploitation of CVE-2021-1376 requires local authentication by the attacker.
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- agent/author
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- agent/weakness
- agent/severity
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/first-publish-date
- agent/event
- agent/source
- agent/tags
- agent/softwarecombine
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/cisco
- canonical/cisco ios xe
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