Cisco ASA Buffer Copy without Checking Size of Input (CVE-2021-1493)

high Tenable OT Security Plugin ID 506151

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a buffer overflow on an affected system. The vulnerability is due to insufficient boundary checks for specific data that is provided to the web services interface of an affected system. An attacker could exploit this vulnerability by sending a malicious HTTP request. A successful exploit could allow the attacker to cause a buffer overflow condition on the affected system, which could disclose data fragments or cause the device to reload, resulting in a denial of service (DoS) condition.

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Solution

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 506151

File Name: tenable_ot_cisco_CVE-2021-1493.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 10/6/2026

Updated: 10/6/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.57

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:N/A:C

CVSS Score Source: CVE-2021-1493

CVSS v3

Risk Factor: High

Base Score: 7.1

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

Vulnerability Information

CPE: cpe:/o:cisco:adaptive_security_appliance_software:9

Required KB Items: Tenable.ot/Cisco

Patch Publication Date: 4/29/2021

Vulnerability Publication Date: 4/29/2021

Reference Information

CVE: CVE-2021-1493

CWE: 120

Detections

Analytics