CVE-2021-1621: Cisco IOS XE Software Interface Queue Wedge Denial of Service Vulnerability
First published: Thu Sep 23 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 Web UI | <17.3.1 | |
| Cisco 1000 Integrated Services Router | ||
| Cisco 1100-4g/6g Integrated Services Router | ||
| Cisco 1109-4p Integrated Services Router | ||
| Cisco 1100 Integrated Services Router | ||
| Cisco 1100 Series Integrated Services Router | ||
| Cisco 1101 Integrated Services Router | ||
| Cisco 1101 Integrated Services Router | ||
| Cisco 1109 Integrated Services Router | ||
| Cisco 1109 Integrated Services Router | ||
| Cisco 1109 Integrated Services Router | ||
| Cisco 1111x-8p | ||
| Cisco 111x Integrated Services Router | ||
| Cisco 111x Integrated Services Router | ||
| Cisco 1120 Integrated Services Router | ||
| Cisco 1160 Integrated Services Router | ||
| Cisco 4000 Series Integrated Services Routers | ||
| Cisco 4221 Integrated Services Router | ||
| Cisco 4321/k9 Integrated Services Router | ||
| Cisco 4331/k9-rf Integrated Services Router | ||
| Cisco 4351/k9-rf Integrated Services Router | ||
| Cisco 4431 Integrated Services Router | ||
| Cisco 4451-X Integrated Services Router | ||
| Cisco 4451-X Integrated Services Router | ||
| Cisco 4441 Integrated Services Router | ||
| Cisco ASR 1000 Series | ||
| Cisco ASR 1000 series software | ||
| Cisco ASR 1001 | ||
| Cisco ASR 1001 | ||
| Cisco ASR 1001-HX-RF | ||
| Cisco ASR 1001-X | ||
| Cisco ASR 1001-X | ||
| Cisco ASR 1002 Fixed Router | ||
| Cisco ASR 1002 Fixed Router | ||
| Cisco ASR 1002-HX | ||
| Cisco ASR 1002-X | ||
| Cisco ASR 1002-X | ||
| Cisco ASR 1004 | ||
| Cisco ASR 1006 | ||
| Cisco ASR 1006-X | ||
| Cisco ASR 1009-X | ||
| Cisco ASR 1013 | ||
| Cisco ASR 1023 Router | ||
| Cisco Cloud Services Router 1000V | ||
| Cisco ISR (Integrated Services Router) |
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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- vendor/cisco
- canonical/cisco ios xe web ui
- canonical/cisco 1000 integrated services router
- canonical/cisco 1100-4g/6g integrated services router
- canonical/cisco 1109-4p integrated services router
- canonical/cisco 1100 integrated services router
- canonical/cisco 1100 series integrated services router
- canonical/cisco 1101 integrated services router
- canonical/cisco 1109 integrated services router
- canonical/cisco 1111x-8p
- canonical/cisco 111x integrated services router
- canonical/cisco 1120 integrated services router
- canonical/cisco 1160 integrated services router
- canonical/cisco 4000 series integrated services routers
- canonical/cisco 4221 integrated services router
- canonical/cisco 4321/k9 integrated services router
- canonical/cisco 4331/k9-rf integrated services router
- canonical/cisco 4351/k9-rf integrated services router
- canonical/cisco 4431 integrated services router
- canonical/cisco 4451-x integrated services router
- canonical/cisco 4441 integrated services router
- canonical/cisco asr 1000 series
- canonical/cisco asr 1000 series software
- canonical/cisco asr 1001
- canonical/cisco asr 1001-hx-rf
- canonical/cisco asr 1001-x
- canonical/cisco asr 1002 fixed router
- canonical/cisco asr 1002-hx
- canonical/cisco asr 1002-x
- 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 router
- canonical/cisco cloud services router 1000v
- canonical/cisco isr (integrated services router)