Cisco ASA Incorrect Conversion Between Numeric Types (CVE-2023-20006)

high Tenable OT Security Plugin ID 506056

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability in the hardware-based SSL/TLS cryptography functionality of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series Appliances could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to an implementation error within the cryptographic functions for SSL/TLS traffic processing when they are offloaded to the hardware. An attacker could exploit this vulnerability by sending a crafted stream of SSL/TLS traffic to an affected device. A successful exploit could allow the attacker to cause an unexpected error in the hardware-based cryptography engine, which could cause the device to reload.

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Solution

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 506056

File Name: tenable_ot_cisco_CVE-2023-20006.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 10/5/2026

Updated: 10/5/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.46

CVSS v3

Risk Factor: High

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/o:cisco:adaptive_security_appliance_software:9.16.4, cpe:/o:cisco:adaptive_security_appliance_software:9.18.2.5, cpe:/o:cisco:adaptive_security_appliance_software:9.18.2

Required KB Items: Tenable.ot/Cisco

Patch Publication Date: 6/28/2023

Vulnerability Publication Date: 6/28/2023

Reference Information

CVE: CVE-2023-20006

CWE: 681

Detections

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