CVE-2022-20849: Cisco IOS XR Software Broadband Network Gateway PPPoE Denial of Service Vulnerability
First published: Fri Nov 15 2024(Updated: )
A vulnerability in the Broadband Network Gateway PPP over Ethernet (PPPoE) feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the PPPoE process to continually crash. This vulnerability exists because the PPPoE feature does not properly handle an error condition within a specific crafted packet sequence. An attacker could exploit this vulnerability by sending a sequence of specific PPPoE packets from controlled customer premises equipment (CPE). A successful exploit could allow the attacker to cause the PPPoE process to continually restart, resulting in a denial of service condition (DoS).Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2022 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XRv 9000 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2022-20849?
CVE-2022-20849 has a high severity rating due to the potential for denial of service attacks.
How do I fix CVE-2022-20849?
To mitigate CVE-2022-20849, it is recommended to apply the latest patches and updates provided by Cisco for the IOS XR Software.
Who is affected by CVE-2022-20849?
CVE-2022-20849 affects devices running Cisco IOS XR Software with the PPP over Ethernet feature enabled.
What type of attacks can CVE-2022-20849 lead to?
CVE-2022-20849 can lead to denial of service conditions by causing the PPPoE process to crash continually.
Is authentication required to exploit CVE-2022-20849?
No, exploitation of CVE-2022-20849 does not require authentication, allowing adjacent attackers to affect the system.
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