Cisco Security Advisory
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
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A vulnerability in the vDaemon process of Cisco SD-WAN Software could allow an unauthenticated, remote attacker to cause a device to reload, resulting in a denial of service (DoS) condition.
This vulnerability is due to insufficient handling of malformed packets. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-dos-Ckn5cVqW
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Vulnerable Products
This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco SD-WAN software:
- SD-WAN vBond Orchestrator Software
- SD-WAN vEdge Cloud Routers
- SD-WAN vEdge Routers
- SD-WAN vManage Software
- SD-WAN vSmart Controller Software
For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco IOS XE SD-WAN.
For Cisco IOS XE SD-WAN, this vulnerability was previously disclosed in cisco-sa-iosxe-sdwdos-4zeEeC9w and Bug ID: CSCvu95283
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There are no workarounds that address this vulnerability.
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Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.htmlAdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
Fixed Releases
Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table(s). To ensure a complete upgrade solution, consider that this advisory is part of a collection that includes the following advisories:
- cisco-sa-sd-wan-vmanage-4TbynnhZ: Cisco SD-WAN vManage Software Vulnerabilities
- cisco-sa-sdw-auth-bypass-65aYqcS2: Cisco SD-WAN vManage Software Authentication Bypass Vulnerability
- cisco-sa-sdwan-dos-Ckn5cVqW: Cisco SD-WAN Software vDaemon Denial of Service Vulnerability
- cisco-sa-sdwan-buffover-MWGucjtO: Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities
Cisco SD-WAN software release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Collection of Advisories Earlier than 18.4 Migrate to a fixed release. Migrate to a fixed release. 18.4 Migrate to a fixed release. Migrate to a fixed release. 19.2 Migrate to a fixed release. Migrate to a fixed release. 19.3 Migrate to a fixed release. Migrate to a fixed release. 20.1 Migrate to a fixed release. Migrate to a fixed release. 20.3 20.3.1 Migrate to a fixed release. 20.4 20.4.1 20.4.1 20.5 20.5.1 20.5.1
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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This vulnerability was found by James Spadaro of the Cisco Advanced Security Initiatives Group during internal security testing.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2021-MAY-05
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