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CVE-2023-20095

Cisco Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software, adaptive security appliance software

A vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of HTTPS requests. An attacker could exploit this vulnerability by sending crafted HTTPS requests to an affected system. A successful exploit could allow the attacker to cause resource exhaustion, resulting in a DoS condition.

CVSS
8.6
EPSS
0.64%
48.2% percentile
CISA KEV
Not listed
Published
2023.11.02
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.64%
Technical severityCVSS 8.6

Vulnerability overview

A vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of HTTPS requests. An attacker could exploit this vulnerability by sending crafted HTTPS requests to an affected system. A successful exploit could allow the attacker to cause resource exhaustion, resulting in a DoS condition.

Affected product and versions

Product
Cisco Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software, adaptive security appliance software
Affected versions
>= 9.8.1, >= 9.8.1.5, >= 9.8.1.7, >= 9.8.2, >= 9.8.2.8, >= 9.8.2.14, >= 9.8.2.15, >= 9.8.2.17, >= 9.8.2.20, >= 9.8.2.24, >= 9.8.2.26, >= 9.8.2.28, >= 9.8.2.33, >= 9.8.2.35, >= 9.8.2.38, >= 9.8.3.8, >= 9.8.3.11, >= 9.8.3.14, >= 9.8.3.16, >= 9.8.3.18
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software, adaptive security appliance software and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
CWE-772
CVE-2023-20095 — Cisco Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software, adaptive security appliance software | SECUFOCUS NOW