CVE-2021-34721: Cisco IOS XR Software Command Injection Vulnerabilities
First published: Thu Sep 09 2021(Updated: )
Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to gain access to the underlying root shell of an affected device and execute arbitrary commands with root privileges. 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 XR | <7.3.2 | |
| Cisco IOS XR | >=7.4.0<=7.4.1 | |
| Cisco Asr 9000v-v2 | ||
| Cisco Asr 9001 | ||
| Cisco Asr 9006 | ||
| Cisco Asr 9010 | ||
| Cisco Asr 9901 | ||
| Cisco Asr 9902 | ||
| Cisco Asr 9903 | ||
| Cisco Asr 9904 | ||
| Cisco Asr 9906 | ||
| Cisco Asr 9910 | ||
| Cisco Asr 9912 | ||
| Cisco Asr 9922 | ||
| Cisco Ios Xrv | ||
| Cisco Ios Xrv 9000 | ||
| Cisco IOS XR | >=7.4.0<7.4.1 | |
| Cisco Ncs 520 | ||
| Cisco Ncs 540 | ||
| Cisco Ncs 540 Fronthaul | ||
| Cisco Ncs 560-4 | ||
| Cisco Ncs 560-7 | ||
| Cisco Ncs 5001 | ||
| Cisco Ncs 5002 | ||
| Cisco Ncs 5011 | ||
| Cisco Ncs 5501 | ||
| Cisco Ncs 5501-se | ||
| Cisco Ncs 5502 | ||
| Cisco Ncs 5502-se | ||
| Cisco Ncs 5508 | ||
| Cisco Ncs 5516 | ||
| Cisco Ncs 6000 | ||
| Cisco Ncs 6008 | ||
| Cisco Ncs 1001 | ||
| Cisco Ncs 1002 | ||
| Cisco Ncs 1004 | ||
| Cisco 8101-32fh | ||
| Cisco 8101-32h | ||
| Cisco 8102-64h | ||
| Cisco 8201 | ||
| Cisco 8201-32fh | ||
| Cisco 8202 | ||
| Cisco 8804 | ||
| Cisco 8808 | ||
| Cisco 8812 | ||
| Cisco 8818 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-34721?
The severity of CVE-2021-34721 is medium.
How can an attacker exploit CVE-2021-34721?
An attacker can exploit CVE-2021-34721 by gaining access to the underlying root shell of an affected device and executing arbitrary commands with root privileges.
Which versions of Cisco IOS XR Software are affected by CVE-2021-34721?
Versions up to 7.3.2 and versions between 7.4.0 and 7.4.1 of Cisco IOS XR Software are affected by CVE-2021-34721.
Is Cisco Asr 9000v-v2 vulnerable to CVE-2021-34721?
No, Cisco Asr 9000v-v2 is not vulnerable to CVE-2021-34721.
Where can I find more information about CVE-2021-34721?
You can find more information about CVE-2021-34721 on the Cisco Security Advisory page.
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/title
- agent/weakness
- agent/author
- agent/severity
- agent/last-modified-date
- agent/tags
- agent/first-publish-date
- agent/event
- agent/description
- vendor/cisco
- canonical/cisco ios xr
- version/cisco ios xr/7.4.0
- version/cisco ios xr/7.4.1
- canonical/cisco asr 9000v-v2
- canonical/cisco asr 9001
- canonical/cisco asr 9006
- canonical/cisco asr 9010
- canonical/cisco asr 9901
- canonical/cisco asr 9902
- canonical/cisco asr 9903
- canonical/cisco asr 9904
- canonical/cisco asr 9906
- canonical/cisco asr 9910
- canonical/cisco asr 9912
- canonical/cisco asr 9922
- canonical/cisco ios xrv
- canonical/cisco ios xrv 9000
- canonical/cisco ncs 520
- canonical/cisco ncs 540
- canonical/cisco ncs 540 fronthaul
- canonical/cisco ncs 560-4
- canonical/cisco ncs 560-7
- canonical/cisco ncs 5001
- canonical/cisco ncs 5002
- canonical/cisco ncs 5011
- canonical/cisco ncs 5501
- canonical/cisco ncs 5501-se
- canonical/cisco ncs 5502
- canonical/cisco ncs 5502-se
- canonical/cisco ncs 5508
- canonical/cisco ncs 5516
- canonical/cisco ncs 6000
- canonical/cisco ncs 6008
- canonical/cisco ncs 1001
- canonical/cisco ncs 1002
- canonical/cisco ncs 1004
- canonical/cisco 8101-32fh
- canonical/cisco 8101-32h
- canonical/cisco 8102-64h
- canonical/cisco 8201
- canonical/cisco 8201-32fh
- canonical/cisco 8202
- canonical/cisco 8804
- canonical/cisco 8808
- canonical/cisco 8812
- canonical/cisco 8818