CVE-2021-1621: Cisco IOS XE Software Interface Queue Wedge Denial of Service Vulnerability
First published: Wed Sep 22 2021(Updated: )
A vulnerability in the Layer 2 punt code of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a queue wedge on an interface that receives specific Layer 2 frames, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of certain Layer 2 frames. An attacker could exploit this vulnerability by sending specific Layer 2 frames on the segment the router is connected to. A successful exploit could allow the attacker to cause a queue wedge on the interface, resulting in a DoS condition.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE | <17.3.1 | |
| Cisco 1000 Integrated Services Router | ||
| Cisco 1100-4g\/6g Integrated Services Router | ||
| Cisco 1100-4p Integrated Services Router | ||
| Cisco 1100-8p Integrated Services Router | ||
| Cisco 1100 Integrated Services Router | ||
| Cisco 1101-4p Integrated Services Router | ||
| Cisco 1101 Integrated Services Router | ||
| Cisco 1109-2p Integrated Services Router | ||
| Cisco 1109-4p Integrated Services Router | ||
| Cisco 1109 Integrated Services Router | ||
| Cisco 1111x-8p Integrated Services Router | ||
| Cisco 1111x Integrated Services Router | ||
| Cisco 111x Integrated Services Router | ||
| Cisco 1120 Integrated Services Router | ||
| Cisco 1160 Integrated Services Router | ||
| Cisco 4000 Integrated Services Router | ||
| Cisco 4221 Integrated Services Router | ||
| Cisco 4321 Integrated Services Router | ||
| Cisco 4331 Integrated Services Router | ||
| Cisco 4351 Integrated Services Router | ||
| Cisco 4431 Integrated Services Router | ||
| Cisco 4451-x Integrated Services Router | ||
| Cisco 4451 Integrated Services Router | ||
| Cisco 4461 Integrated Services Router | ||
| Cisco ASR 1000 | ||
| Cisco Asr 1000-x | ||
| Cisco Asr 1001 | ||
| Cisco Asr 1001-hx | ||
| Cisco Asr 1001-hx R | ||
| Cisco Asr 1001-x | ||
| Cisco Asr 1001-x R | ||
| Cisco Asr 1002 | ||
| Cisco Asr 1002-hx | ||
| Cisco Asr 1002-hx R | ||
| Cisco Asr 1002-x | ||
| Cisco Asr 1002-x R | ||
| Cisco Asr 1004 | ||
| Cisco Asr 1006 | ||
| Cisco Asr 1006-x | ||
| Cisco Asr 1009-x | ||
| Cisco Asr 1013 | ||
| Cisco Asr 1023 | ||
| Cisco Csr 1000v | ||
| Cisco Isrv |
Remedy
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-quewedge-69BsHUBW
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this Cisco IOS XE Software vulnerability?
The vulnerability ID of this Cisco IOS XE Software vulnerability is CVE-2021-1621.
What is the severity of CVE-2021-1621?
The severity of CVE-2021-1621 is high, with a CVSS score of 7.4.
How does CVE-2021-1621 impact Cisco IOS XE Software?
CVE-2021-1621 allows an unauthenticated attacker to cause a denial of service (DoS) condition on an interface that receives specific Layer 2 frames.
Which version of Cisco IOS XE Software is affected by CVE-2021-1621?
Cisco IOS XE Software version 17.3.1 is affected by CVE-2021-1621.
How can I mitigate the vulnerability in Cisco IOS XE Software CVE-2021-1621?
To mitigate the vulnerability, it is recommended to update to a fixed software release or apply the available workaround as mentioned in the Cisco Security Advisory.
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- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/weakness
- agent/title
- agent/severity
- agent/last-modified-date
- agent/author
- agent/remedy
- agent/references
- agent/tags
- agent/description
- agent/event
- agent/first-publish-date
- vendor/cisco
- canonical/cisco ios xe
- canonical/cisco 1000 integrated services router
- canonical/cisco 1100-4g\/6g integrated services router
- canonical/cisco 1100-4p integrated services router
- canonical/cisco 1100-8p integrated services router
- canonical/cisco 1100 integrated services router
- canonical/cisco 1101-4p integrated services router
- canonical/cisco 1101 integrated services router
- canonical/cisco 1109-2p integrated services router
- canonical/cisco 1109-4p integrated services router
- canonical/cisco 1109 integrated services router
- canonical/cisco 1111x-8p integrated services router
- canonical/cisco 1111x integrated services router
- canonical/cisco 111x integrated services router
- canonical/cisco 1120 integrated services router
- canonical/cisco 1160 integrated services router
- canonical/cisco 4000 integrated services router
- canonical/cisco 4221 integrated services router
- canonical/cisco 4321 integrated services router
- canonical/cisco 4331 integrated services router
- canonical/cisco 4351 integrated services router
- canonical/cisco 4431 integrated services router
- canonical/cisco 4451-x integrated services router
- canonical/cisco 4451 integrated services router
- canonical/cisco 4461 integrated services router
- canonical/cisco asr 1000
- canonical/cisco asr 1000-x
- canonical/cisco asr 1001
- canonical/cisco asr 1001-hx
- canonical/cisco asr 1001-hx r
- canonical/cisco asr 1001-x
- canonical/cisco asr 1001-x r
- canonical/cisco asr 1002
- canonical/cisco asr 1002-hx
- canonical/cisco asr 1002-hx r
- canonical/cisco asr 1002-x
- canonical/cisco asr 1002-x r
- canonical/cisco asr 1004
- canonical/cisco asr 1006
- canonical/cisco asr 1006-x
- canonical/cisco asr 1009-x
- canonical/cisco asr 1013
- canonical/cisco asr 1023
- canonical/cisco csr 1000v
- canonical/cisco isrv