CVE-2020-3423

Cisco IOS XE Software Arbitrary Code Execution Vulnerability

MEDIUM

6.7

CVSS Score

Published: September 24, 2020 at 06:01 PM UTC

Updated: June 17, 2026 at 03:18 AM UTC

26 products affected across 1 vendorIOS XeAsr 1002-xAsr 1006

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Severity

MEDIUM6.7

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

A vulnerability in the implementation of the Lua interpreter that is integrated in Cisco IOS XE Software could allow an authenticated, local attacker to execute arbitrary code with root privileges on the underlying Linux operating system (OS) of an affected device. The vulnerability is due to insufficient restrictions on Lua function calls within the context of user-supplied Lua scripts. An attacker with valid administrative credentials could exploit this vulnerability by submitting a malicious Lua script. When this file is processed, an exploitable buffer overflow condition could occur. A successful exploit could allow the attacker to execute arbitrary code with root privileges on the underlying Linux OS of the affected device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xe · Cisco

95%

All versions

cisco-1100-integrated-services-router (environment) · cisco-1101-integrated-services-router (environment) · cisco-1109-integrated-services-router (environment) · cisco-1111x-integrated-services-router (environment) · cisco-111x-integrated-services-router (environment) · cisco-1120-integrated-services-router (environment) · cisco-1160-integrated-services-router (environment) · cisco-4221-integrated-services-router (environment) · cisco-4321-integrated-services-router (environment) · cisco-4331-integrated-services-router (environment) · cisco-4351-integrated-services-router (environment) · cisco-4431-integrated-services-router (environment) · cisco-4451-x-integrated-services-router (environment) · cisco-4461-integrated-services-router (environment) · cisco-asr-1001-hx (environment) · cisco-asr-1001-x (environment) · cisco-asr-1002-hx (environment) · cisco-asr-1002-x (environment) · cisco-asr-1004 (environment) · cisco-asr-1006 (environment) · cisco-asr-1006-x (environment) · cisco-asr-1009-x (environment) · cisco-asr-1013 (environment) · cisco-cbr-8-converged-broadband-router (environment) · cisco-cloud-services-router-1000v (environment)

1100 Integrated Services Router · Ciscodevice

80%

All versions

1101 Integrated Services Router · Ciscodevice

80%

All versions

1109 Integrated Services Router · Ciscodevice

80%

All versions

1111X Integrated Services Router · Ciscodevice

80%

All versions