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CVE-2023-20247

MEDIUMCVSS 4.3/10EPSS 0.29%

Last modified

CVE-2023-20247 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability
0.29%

20.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software9.8.1
CiscoAdaptive Security Appliance Software9.8.1.5
CiscoAdaptive Security Appliance Software9.8.1.7
CiscoAdaptive Security Appliance Software9.8.2
CiscoAdaptive Security Appliance Software9.8.2.8
CiscoAdaptive Security Appliance Software9.8.2.14
CiscoAdaptive Security Appliance Software9.8.2.15
CiscoAdaptive Security Appliance Software9.8.2.17
CiscoAdaptive Security Appliance Software9.8.2.20
CiscoAdaptive Security Appliance Software9.8.2.24
CiscoAdaptive Security Appliance Software9.8.2.26
CiscoAdaptive Security Appliance Software9.8.2.28
CiscoAdaptive Security Appliance Software9.8.2.33
CiscoAdaptive Security Appliance Software9.8.2.35
CiscoAdaptive Security Appliance Software9.8.2.38
CiscoAdaptive Security Appliance Software9.8.3
CiscoAdaptive Security Appliance Software9.8.3.8
CiscoAdaptive Security Appliance Software9.8.3.11
CiscoAdaptive Security Appliance Software9.8.3.14
CiscoAdaptive Security Appliance Software9.8.3.16
CiscoAdaptive Security Appliance Software9.8.3.18
CiscoAdaptive Security Appliance Software9.8.3.21
CiscoAdaptive Security Appliance Software9.8.3.26
CiscoAdaptive Security Appliance Software9.8.3.29
CiscoAdaptive Security Appliance Software9.8.4.8
CiscoAdaptive Security Appliance Software9.8.4.10
CiscoAdaptive Security Appliance Software9.8.4.12
CiscoAdaptive Security Appliance Software9.8.4.15
CiscoAdaptive Security Appliance Software9.8.4.17
CiscoAdaptive Security Appliance Software9.8.4.20
CiscoAdaptive Security Appliance Software9.8.4.22
CiscoAdaptive Security Appliance Software9.8.4.25
CiscoAdaptive Security Appliance Software9.8.4.26
CiscoAdaptive Security Appliance Software9.8.4.29
CiscoAdaptive Security Appliance Software9.8.4.32
CiscoAdaptive Security Appliance Software9.8.4.33
CiscoAdaptive Security Appliance Software9.8.4.34
CiscoAdaptive Security Appliance Software9.8.4.35
CiscoAdaptive Security Appliance Software9.8.4.39
CiscoAdaptive Security Appliance Software9.8.4.40
CiscoAdaptive Security Appliance Software9.8.4.41
CiscoAdaptive Security Appliance Software9.8.4.43
CiscoAdaptive Security Appliance Software9.8.4.44
CiscoAdaptive Security Appliance Software9.8.4.45
CiscoAdaptive Security Appliance Software9.8.4.46
CiscoAdaptive Security Appliance Software9.8.4.48
CiscoAdaptive Security Appliance Software9.12.1
CiscoAdaptive Security Appliance Software9.12.1.2
CiscoAdaptive Security Appliance Software9.12.1.3
CiscoAdaptive Security Appliance Software9.12.2

Showing 50 of 229 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-20247?
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.
How severe is CVE-2023-20247?
CVE-2023-20247 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.
How do I fix CVE-2023-20247?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-20247?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST