CVE-2023-20247

What it is

A vulnerability in the remote access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to bypass a configured multiple certificate authentication policy and connect using only a valid username and password. This vulnerability is due to improper error handling during remote access VPN authentication. An attacker could exploit this vulnerability by sending crafted requests during remote access VPN session establishment. A successful exploit could allow the attacker to bypass the configured multiple certificate authentication policy while retaining the privileges and permissions associated with the original connection profile.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-11-01 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-08-11 19:33 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.4% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-11-01 18:15 UTC

Last modified

2026-08-11 19:33 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-288

Record status

Modified

Affected

• Cisco Adaptive Security Appliance Software 9.8.1
• Cisco Adaptive Security Appliance Software 9.8.1.5
• Cisco Adaptive Security Appliance Software 9.8.1.7
• Cisco Adaptive Security Appliance Software 9.8.2
• Cisco Adaptive Security Appliance Software 9.8.2.8
• Cisco Adaptive Security Appliance Software 9.8.2.14
• Cisco Adaptive Security Appliance Software 9.8.2.15
• Cisco Adaptive Security Appliance Software 9.8.2.17

Attack profile CVSS 3.1 · 5.0

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-20247.md and follow it. Check whether this project is affected by CVE-2023-20247. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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