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CVE-2022-20849

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
15/11/2024
Last modified:
01/08/2025

Description

A vulnerability in the Broadband Network Gateway PPP over Ethernet (PPPoE) feature of Cisco&amp;nbsp;IOS XR Software could allow an unauthenticated, adjacent attacker to cause the PPPoE process to continually crash.<br /> 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&amp;nbsp;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&amp;nbsp;IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .

Impact

Vector 3.x
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 6.10 MEDIUM
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
6.10
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.5.15:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.6.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.6.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.7.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.7.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.7.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.7.35:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.8.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:6.8.2:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools