CVE-2021-34708 : Multiple vulnerabilities in image verification checks of Cisco Network Convergen

Multiple vulnerabilities in image verification checks of Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for Cisco 8000 Series Routers could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. For more information about these vulnerabilities, see the Details section of this advisory.

Published 2021-09-09 05:15:07

Updated 2021-09-21 19:47:09

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Execute code

Products affected by CVE-2021-34708

Cisco » Ios Xr
Versions from including (>=) 7.4.0 and before (<) 7.4.1
cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » N540-12z20g-sys-a » Version: N/A
When used together with: Cisco » N540-12z20g-sys-d » Version: N/A
When used together with: Cisco » N540-24z8q2c-m » Version: N/A
When used together with: Cisco » N540-24z8q2c-sys » Version: N/A
When used together with: Cisco » N540-28z4c-sys-a » Version: N/A
When used together with: Cisco » N540-28z4c-sys-d » Version: N/A
When used together with: Cisco » N540-acc-sys » Version: N/A
When used together with: Cisco » N540x-12z16g-sys-a » Version: N/A
When used together with: Cisco » N540x-12z16g-sys-d » Version: N/A
When used together with: Cisco » N540x-16z4g8q2c-a » Version: N/A
When used together with: Cisco » N540x-16z4g8q2c-d » Version: N/A
When used together with: Cisco » N540x-acc-sys » Version: N/A
Cisco » Ios Xr
Versions before (<) 7.3.2
cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » 8101-32fh » Version: N/A
When used together with: Cisco » 8101-32h
When used together with: Cisco » 8102-64h » Version: N/A
When used together with: Cisco » 8201 » Version: N/A
When used together with: Cisco » 8201-32fh » Version: N/A
When used together with: Cisco » 8202 » Version: N/A
When used together with: Cisco » 8800 12-slot » Version: N/A
When used together with: Cisco » 8800 18-slot » Version: N/A
When used together with: Cisco » 8800 4-slot » Version: N/A
When used together with: Cisco » 8800 8-slot » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-34708

EPSS FAQ

0.04%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 6 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-34708

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.2	HIGH	AV:L/AC:L/Au:N/C:C/I:C/A:C	3.9	10.0	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
6.0	MEDIUM	CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N	0.8	5.2	Cisco Systems, Inc.
Attack Vector: Local Attack Complexity: Low Privileges Required: High User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: None
6.7	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	0.8	5.9	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: High User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-34708

CWE-347 Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.
Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)

References for CVE-2021-34708

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-QN9mCzwn

Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers Image Verification Vulnerabilities
Vendor Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2021-34708

Products affected by CVE-2021-34708

Exploit prediction scoring system (EPSS) score for CVE-2021-34708

CVSS scores for CVE-2021-34708

CWE ids for CVE-2021-34708

References for CVE-2021-34708