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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
A vulnerability in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to cause the affected line card to reboot. This vulnerability is due to incorrect handling of specific Ethernet frames that cause a spin loop that can make the network processors unresponsive. An attacker could exploit this vulnerability by sending specific types of Ethernet frames on the segment where the affected line cards are attached. A successful exploit could allow the attacker to cause the affected line card to reboot.
Metrics
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CVE Modified by Cisco Systems, Inc.5/14/2024 5:14:53 AM
Action
Type
Old Value
New Value
CVE Modified by Cisco Systems, Inc.11/06/2023 10:36:10 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
Cisco Systems, Inc. AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Removed
CVSS V3
Cisco Systems, Inc. AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Initial Analysis by NIST9/21/2021 3:18:20 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
NIST AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Added
CVSS V2
NIST (AV:A/AC:L/Au:N/C:N/I:N/A:C)
Added
CWE
NIST NVD-CWE-Other
Added
CPE Configuration
AND
OR
*cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:* versions from (including) 6.4 up to (excluding) 6.6.3
*cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.7.1
*cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:* versions from (including) 7.0 up to (excluding) 7.0.2
*cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:* versions from (including) 7.1 up to (excluding) 7.1.1
OR
cpe:2.3:h:cisco:asr_9000:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9000v-v2:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:*
Changed
Reference Type
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-npspin-QYpwdhFD No Types Assigned
CVE Modified by Cisco Systems, Inc.9/09/2021 2:15:11 AM
Action
Type
Old Value
New Value
Changed
Description
A vulnerability in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to cause the affected line card to reboot.
This vulnerability is due to incorrect handling of specific Ethernet frames that cause a spin loop that can make the network processors unresponsive. An attacker could exploit this vulnerability by sending specific types of Ethernet frames on the segment where the affected line cards are attached. A successful exploit could allow the attacker to cause the affected line card to reboot.
A vulnerability in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to cause the affected line card to reboot. This vulnerability is due to incorrect handling of specific Ethernet frames that cause a spin loop that can make the network processors unresponsive. An attacker could exploit this vulnerability by sending specific types of Ethernet frames on the segment where the affected line cards are attached. A successful exploit could allow the attacker to cause the affected line card to reboot.
Quick Info
CVE Dictionary Entry: CVE-2021-34713 NVD
Published Date: 09/09/2021 NVD
Last Modified: 06/16/2026
Source: Cisco Systems, Inc.