CVE-2020-3422: Cisco IOS XE Software IP Service Level Agreements Denial of Service Vulnerability
First published: Thu Sep 24 2020(Updated: )
A vulnerability in the IP Service Level Agreement (SLA) responder feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the IP SLA responder to reuse an existing port, resulting in a denial of service (DoS) condition. The vulnerability exists because the IP SLA responder could consume a port that could be used by another feature. An attacker could exploit this vulnerability by sending specific IP SLA control packets to the IP SLA responder on an affected device. The control packets must include the port number that could be used by another configured feature. A successful exploit could allow the attacker to cause an in-use port to be consumed by the IP SLA responder, impacting the feature that was using the port and resulting in a DoS condition.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE | =16.9.3 | |
| Cisco 1100 Integrated Services Router | ||
| Cisco 1101 Integrated Services Router | ||
| Cisco 1109 Integrated Services Router | ||
| Cisco 1111x Integrated Services Router | ||
| Cisco 111x Integrated Services Router | ||
| Cisco 1120 Integrated Services Router | ||
| Cisco 1160 Integrated Services Router | ||
| Cisco 4221 Integrated Services Router | ||
| Cisco 4331 Integrated Services Router | ||
| Cisco 4431 Integrated Services Router | ||
| Cisco 4461 Integrated Services Router | ||
| Cisco Asr 1001-hx | ||
| Cisco Asr 1001-x | ||
| Cisco Asr 1002-hx | ||
| Cisco Asr 1002-x | ||
| Cisco Asr 1004 | ||
| Cisco Asr 1006 | ||
| Cisco Asr 1006-x | ||
| Cisco Asr 1009-x | ||
| Cisco Asr 1013 | ||
| Cisco Catalyst 3650 | ||
| Cisco Catalyst 3850 | ||
| Cisco Catalyst 9200 | ||
| Cisco Catalyst 9300 | ||
| Cisco Catalyst 9400 | ||
| Cisco Catalyst 9500 | ||
| Cisco Catalyst 9600 | ||
| Cisco Catalyst 9800 | ||
| Cisco Csr 1000v |
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Reference Links
Frequently Asked Questions
What is CVE-2020-3422?
CVE-2020-3422 is a vulnerability in the IP Service Level Agreement (SLA) responder feature of Cisco IOS XE Software.
What is the severity of CVE-2020-3422?
The severity of CVE-2020-3422 is high with a CVSS score of 7.5.
How does CVE-2020-3422 impact Cisco IOS XE Software?
CVE-2020-3422 allows an unauthenticated, remote attacker to cause the IP SLA responder to reuse an existing port, resulting in a denial of service (DoS) condition.
Which versions of Cisco IOS XE Software are affected by CVE-2020-3422?
Cisco IOS XE Software version 16.9.3 is affected by CVE-2020-3422.
How can I fix CVE-2020-3422?
To fix CVE-2020-3422, Cisco recommends upgrading to a fixed software release.
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/severity
- agent/title
- agent/last-modified-date
- agent/weakness
- agent/author
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- vendor/cisco
- canonical/cisco ios xe
- version/cisco ios xe/16.9.3
- canonical/cisco 1100 integrated services router
- canonical/cisco 1101 integrated services router
- canonical/cisco 1109 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 4221 integrated services router
- canonical/cisco 4331 integrated services router
- canonical/cisco 4431 integrated services router
- canonical/cisco 4461 integrated services router
- canonical/cisco asr 1001-hx
- canonical/cisco asr 1001-x
- 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 catalyst 3650
- canonical/cisco catalyst 3850
- canonical/cisco catalyst 9200
- canonical/cisco catalyst 9300
- canonical/cisco catalyst 9400
- canonical/cisco catalyst 9500
- canonical/cisco catalyst 9600
- canonical/cisco catalyst 9800
- canonical/cisco csr 1000v