CVE-2021-34721

CVSS V2 Medium 6.9 CVSS V3 Medium 6.7

Description

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.

Overview

CVE ID
CVE-2021-34721

Assigner
ykramarz@cisco.com

Vulnerability Status
Analyzed

Published Version
2021-09-09T05:15:11

Last Modified Date
2021-09-21T12:48:00

Weakness Enumerations

CWE	URL
CWE-78	http://cwe.mitre.org/data/definitions/78.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
		AND
cpe:2.3:o:cisco:ios_xr::::::::	1	OR		7.3.2
cpe:2.3:o:cisco:ios_xr::::::::	1	OR	7.4.0	7.4.1
cpe:2.3:h:cisco:asr_9000v-v2:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9001:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9006:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9010:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9901:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9902:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9903:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9904:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9906:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9910:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9912:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_9922:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xr::::::::	1	OR		7.3.2
cpe:2.3:o:cisco:ios_xr::::::::	1	OR	7.4.0	7.4.1
cpe:2.3:h:cisco:ios_xrv:-:::::::*	0	OR
cpe:2.3:h:cisco:ios_xrv_9000:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xr::::::::	1	OR		7.3.2
cpe:2.3:o:cisco:ios_xr::::::::	1	OR	7.4.0	7.4.1
cpe:2.3:h:cisco:ncs_520:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_540:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_540_fronthaul:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_560-4:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_560-7:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xr::::::::	1	OR		7.3.2
cpe:2.3:o:cisco:ios_xr::::::::	1	OR	7.4.0	7.4.1
cpe:2.3:h:cisco:ncs_5001:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_5002:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_5011:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xr::::::::	1	OR		7.3.2
cpe:2.3:o:cisco:ios_xr::::::::	1	OR	7.4.0	7.4.1
cpe:2.3:h:cisco:ncs_5501:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_5501-se:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_5502:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_5502-se:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_5508:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_5516:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xr::::::::	1	OR		7.3.2
cpe:2.3:o:cisco:ios_xr::::::::	1	OR	7.4.0	7.4.1
cpe:2.3:h:cisco:ncs_6000:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_6008:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xr::::::::	1	OR		7.3.2
cpe:2.3:o:cisco:ios_xr::::::::	1	OR	7.4.0	7.4.1
cpe:2.3:h:cisco:ncs_1001:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_1002:-:::::::*	0	OR
cpe:2.3:h:cisco:ncs_1004:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xr::::::::	1	OR		7.3.2
cpe:2.3:o:cisco:ios_xr::::::::	1	OR	7.4.0	7.4.1
cpe:2.3:h:cisco:8101-32fh:-:::::::*	0	OR
cpe:2.3:h:cisco:8101-32h:-:::::::*	0	OR
cpe:2.3:h:cisco:8102-64h:-:::::::*	0	OR
cpe:2.3:h:cisco:8201:-:::::::*	0	OR
cpe:2.3:h:cisco:8201-32fh:-:::::::*	0	OR
cpe:2.3:h:cisco:8202:-:::::::*	0	OR
cpe:2.3:h:cisco:8804:-:::::::*	0	OR
cpe:2.3:h:cisco:8808:-:::::::*	0	OR
cpe:2.3:h:cisco:8812:-:::::::*	0	OR
cpe:2.3:h:cisco:8818:-:::::::*	0	OR

CVSS Version 2

Version
2.0

Vector String
AV:L/AC:M/Au:N/C:C/I:C/A:C

Access Vector
LOCAL

Access Compatibility
MEDIUM

Authentication
NONE

Confidentiality Impact
COMPLETE

Integrity Impact
COMPLETE

Availability Impact
COMPLETE

Base Score
6.9

Severity
MEDIUM

Exploitability Score
3.4

Impact Score
10

CVSS Version 3

Version
3.1

Vector String
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL

Attack Compatibility
LOW

Privileges Required
HIGH

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
6.7

Base Severity
MEDIUM

Exploitability Score
0.8

Impact Score
5.9

References

Reference URL	Reference Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-cmd-inj-wbZKvPxc	Vendor Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-34721
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34721

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 16:04:18				Added to TrackCVE
2022-12-05 10:10:02	psirt@cisco.com	ykramarz@cisco.com	CVE Assigner	updated
2022-12-05 10:10:02	2021-09-09T05:15Z	2021-09-09T05:15:11	CVE Published Date	updated
2022-12-05 10:10:02		2021-09-21T12:48:00	CVE Modified Date	updated
2022-12-05 10:10:02		Analyzed	Vulnerability Status	updated