PT-2022-5097 · Cisco · Cisco Ios Xr

Published 2022-09-14 · Updated 2025-08-01 · CVE-2022-20849

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco IOS XR Software (affected versions not specified)

Description 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.

Recommendations Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. Update to the latest software version to resolve the issue.

Fix

DoS

Weakness Enumeration

CWE-391

Related Identifiers

BDU:2022-06326

CVE-2022-20849

Affected Products

Cisco Ios Xr

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2022-20849 · Security Note
• https://bdu.fstec.ru/vul/2022-06326 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-bng-Gmg5Gxt · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2022-20849 · Vendor Advisory
• https://twitter.com/CVEnew/status/1857448648918933839 · Twitter Post
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-bng-Gmg5Gxt · Note
• https://t.me/cveNotify/130592 · Telegram Post