PT-2021-4138 · Cisco · Cisco Ios Xr

Published 2021-09-08 · Updated 2021-09-21 · CVE-2021-34719

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description The issue concerns multiple vulnerabilities in the CLI of Cisco IOS XR Software, allowing an authenticated, local attacker with a low-privileged account to elevate privileges on an affected device. This is due to the lack of measures to neutralize special elements used in the operating system command. Exploitation of the vulnerability may allow an attacker to elevate their privileges or execute arbitrary commands with root privileges.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

BDU:2021-04731

CVE-2021-34719

Affected Products

Cisco Ios Xr

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2021-34719 · Security Note
• https://bdu.fstec.ru/vul/2021-04731 · Security Note
• https://osv.dev/vulnerability/CVE-2021-34719 · Vendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privescal-dZYMrKf · Vendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privescal-dZYMrKf?vsfCisco20Security20AdvisoryvscatSecurity20IntelligencevstypeRSSvspCisco20IOS20XR20Software20Authenticated20User20Privilege20Escalation20Vulnerabilitiesvsk1 · Note
• https://t.me/cibsecurity/28551 · Telegram Post