---
id: CVE-2020-3259
title: >-
  A vulnerability in the web services interface of Cisco Adaptive Security
  Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
  could allow an unauthenticated, remote attacker to retrieve memory contents on
  an affecte…
summary: >-
  A vulnerability in the web services interface of Cisco Adaptive Security
  Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
  could allow an unauthenticated, remote attacker to retrieve memory contents on
  an affecte…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-200
vendor: cisco
product: secure_firewall_threat_defense
affected:
  - 'secure_firewall_threat_defense >= 6.2.3, < 6.2.3.16'
  - 'secure_firewall_threat_defense >= 6.3.0, < 6.3.0.6'
  - 'secure_firewall_threat_defense >= 6.4.0, < 6.4.0.9'
  - 'secure_firewall_threat_defense >= 6.5.0, < 6.5.0.5'
  - 'adaptive_security_appliance_software >= 9.8, < 9.8.4.20'
  - 'adaptive_security_appliance_software >= 9.9, < 9.9.2.67'
  - 'adaptive_security_appliance_software >= 9.10, < 9.10.1.40'
  - 'adaptive_security_appliance_software >= 9.12, < 9.12.3.9'
  - 'adaptive_security_appliance_software >= 9.13, < 9.13.1.10'
patched:
  - secure_firewall_threat_defense 6.5.0.5
  - adaptive_security_appliance_software 9.13.1.10
published: '2020-05-06'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-3259'
references:
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3259
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
epss: 0.71789
epssPercentile: 0.99397
kev: true
kevDateAdded: '2024-02-15'
kevDueDate: '2024-03-07'
kevRansomware: true
exploited: true
ingestedAt: '2026-08-11T19:48:27.747Z'
---

## Overview

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

## Affected

- `secure_firewall_threat_defense >= 6.2.3, < 6.2.3.16`
- `secure_firewall_threat_defense >= 6.3.0, < 6.3.0.6`
- `secure_firewall_threat_defense >= 6.4.0, < 6.4.0.9`
- `secure_firewall_threat_defense >= 6.5.0, < 6.5.0.5`
- `adaptive_security_appliance_software >= 9.8, < 9.8.4.20`
- `adaptive_security_appliance_software >= 9.9, < 9.9.2.67`
- `adaptive_security_appliance_software >= 9.10, < 9.10.1.40`
- `adaptive_security_appliance_software >= 9.12, < 9.12.3.9`
- `adaptive_security_appliance_software >= 9.13, < 9.13.1.10`

## Remediation

Upgrade past the affected range:

- `secure_firewall_threat_defense 6.5.0.5`
- `adaptive_security_appliance_software 9.13.1.10`