Strix
26.1K

CVE-2023-20256

MEDIUMCVSS 5.8/10EPSS 0.56%

Last modified

CVE-2023-20256 is a medium-severity vulnerability rated 5.8/10 on the CVSS scale. Multiple vulnerabilities in the per-user-override feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured access control list (ACL) and allow traffic that should be denied to flow through an affected device. These vulnerabilities are due to a logic error that could occur when the affected software constructs and applies per-user-override rules. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

Description

Multiple vulnerabilities in the per-user-override feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured access control list (ACL) and allow traffic that should be denied to flow through an affected device. These vulnerabilities are due to a logic error that could occur when the affected software constructs and applies per-user-override rules. An attacker could exploit these vulnerabilities by connecting to a network through an affected device that has a vulnerable configuration. A successful exploit could allow the attacker to bypass the interface ACL and access resources that would should be protected.

Metrics

CVSS 3.1
5.8/10

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

EPSS Probability
0.56%

42.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
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 Software9.12.4.2
CiscoAdaptive Security Appliance Software9.12.4.4
CiscoAdaptive Security Appliance Software9.12.4.7
CiscoAdaptive Security Appliance Software9.12.4.8
CiscoAdaptive Security Appliance Software9.12.4.10
CiscoAdaptive Security Appliance Software9.12.4.13
CiscoAdaptive Security Appliance Software9.12.4.18
CiscoAdaptive Security Appliance Software9.12.4.24
CiscoAdaptive Security Appliance Software9.12.4.26
CiscoAdaptive Security Appliance Software9.12.4.29
CiscoAdaptive Security Appliance Software9.12.4.30
CiscoAdaptive Security Appliance Software9.12.4.35
CiscoAdaptive Security Appliance Software9.12.4.37
CiscoAdaptive Security Appliance Software9.12.4.38
CiscoAdaptive Security Appliance Software9.12.4.39
CiscoAdaptive Security Appliance Software9.12.4.40
CiscoAdaptive Security Appliance Software9.12.4.41
CiscoAdaptive Security Appliance Software9.12.4.47
CiscoAdaptive Security Appliance Software9.12.4.48
CiscoAdaptive Security Appliance Software9.12.4.50
CiscoAdaptive Security Appliance Software9.12.4.52
CiscoAdaptive Security Appliance Software9.12.4.54
CiscoAdaptive Security Appliance Software9.12.4.55
CiscoAdaptive Security Appliance Software9.12.4.56
CiscoAdaptive Security Appliance Software9.14.1.10
CiscoAdaptive Security Appliance Software9.14.1.15
CiscoAdaptive Security Appliance Software9.14.1.19
CiscoAdaptive Security Appliance Software9.14.1.30
CiscoAdaptive Security Appliance Software9.14.2
CiscoAdaptive Security Appliance Software9.14.2.4
CiscoAdaptive Security Appliance Software9.14.2.8
CiscoAdaptive Security Appliance Software9.14.2.13
CiscoAdaptive Security Appliance Software9.14.2.15
CiscoAdaptive Security Appliance Software9.14.3

Showing 50 of 152 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-20256?
Multiple vulnerabilities in the per-user-override feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured access control list (ACL) and allow traffic that should be denied to flow through an affected device. These vulnerabilities are due to a logic error that could occur when the affected software constructs and applies per-user-override rules. An attacker could exploit these vulnerabilities by connecting to a network through an affected device that has a vulnerable configuration. A successful exploit could allow the attacker to bypass the interface ACL and access resources that would should be protected.
How severe is CVE-2023-20256?
CVE-2023-20256 has a CVSS score of 5.8/10 (MEDIUM severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.
How do I fix CVE-2023-20256?
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-2023-20256?

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

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Source: NVD / NIST