CVE-2023-20042
First published: Wed Nov 01 2023(Updated: )
A vulnerability in the AnyConnect SSL 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 an implementation error within the SSL/TLS session handling process that can prevent the release of a session handler under specific conditions. An attacker could exploit this vulnerability by sending crafted SSL/TLS traffic to an affected device, increasing the probability of session handler leaks. A successful exploit could allow the attacker to eventually deplete the available session handler pool, preventing new sessions from being established and causing a DoS condition.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Firepower Threat Defense | =7.0.0 | |
| Cisco Firepower Threat Defense | =7.0.0.1 | |
| Cisco Firepower Threat Defense | =7.0.1 | |
| Cisco Firepower Threat Defense | =7.0.1.1 | |
| Cisco Firepower Threat Defense | =7.0.2 | |
| Cisco Firepower Threat Defense | =7.0.2.1 | |
| Cisco Firepower Threat Defense | =7.0.3 | |
| Cisco Firepower Threat Defense | =7.0.4 | |
| Cisco Firepower Threat Defense | =7.0.5 | |
| Cisco Firepower Threat Defense | =7.1.0 | |
| Cisco Firepower Threat Defense | =7.1.0.1 | |
| Cisco Firepower Threat Defense | =7.1.0.2 | |
| Cisco Firepower Threat Defense | =7.1.0.3 | |
| Cisco Firepower Threat Defense | =7.2.0 | |
| Cisco Firepower Threat Defense | =7.2.0.1 | |
| Cisco Firepower Threat Defense | =7.2.1 | |
| Cisco Firepower Threat Defense | =7.2.2 | |
| Cisco Firepower Threat Defense | =7.2.3 | |
| Cisco Firepower Threat Defense | =7.3.0 | |
| Cisco Firepower Threat Defense | =7.3.1 | |
| Cisco Firepower Threat Defense | =7.3.1.1 | |
| Cisco Adaptive Security Appliance Software | =9.16.1 | |
| Cisco Adaptive Security Appliance Software | =9.16.1.28 | |
| Cisco Adaptive Security Appliance Software | =9.16.2 | |
| Cisco Adaptive Security Appliance Software | =9.16.2.3 | |
| Cisco Adaptive Security Appliance Software | =9.16.2.7 | |
| Cisco Adaptive Security Appliance Software | =9.16.2.11 | |
| Cisco Adaptive Security Appliance Software | =9.16.2.13 | |
| Cisco Adaptive Security Appliance Software | =9.16.2.14 | |
| Cisco Adaptive Security Appliance Software | =9.16.3 | |
| Cisco Adaptive Security Appliance Software | =9.16.3.3 | |
| Cisco Adaptive Security Appliance Software | =9.16.3.14 | |
| Cisco Adaptive Security Appliance Software | =9.16.3.15 | |
| Cisco Adaptive Security Appliance Software | =9.16.3.19 | |
| Cisco Adaptive Security Appliance Software | =9.16.3.23 | |
| Cisco Adaptive Security Appliance Software | =9.16.4 | |
| Cisco Adaptive Security Appliance Software | =9.16.4.9 | |
| Cisco Adaptive Security Appliance Software | =9.17.1 | |
| Cisco Adaptive Security Appliance Software | =9.17.1.7 | |
| Cisco Adaptive Security Appliance Software | =9.17.1.9 | |
| Cisco Adaptive Security Appliance Software | =9.17.1.10 | |
| Cisco Adaptive Security Appliance Software | =9.17.1.11 | |
| Cisco Adaptive Security Appliance Software | =9.17.1.13 | |
| Cisco Adaptive Security Appliance Software | =9.17.1.15 | |
| Cisco Adaptive Security Appliance Software | =9.17.1.20 | |
| Cisco Adaptive Security Appliance Software | =9.18.1 | |
| Cisco Adaptive Security Appliance Software | =9.18.1.3 | |
| Cisco Adaptive Security Appliance Software | =9.18.2 | |
| Cisco Adaptive Security Appliance Software | =9.18.2.5 | |
| Cisco Adaptive Security Appliance Software | =9.18.2.7 | |
| Cisco Adaptive Security Appliance Software | =9.19.1 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this vulnerability?
The vulnerability ID is CVE-2023-20042.
What is the severity level of CVE-2023-20042?
The severity level of CVE-2023-20042 is high.
Which software is affected by CVE-2023-20042?
Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software are affected by CVE-2023-20042.
What is the impact of CVE-2023-20042?
CVE-2023-20042 can cause a denial of service (DoS) condition on an affected device.
Where can I find more information about CVE-2023-20042?
You can find more information about CVE-2023-20042 on the Cisco Security Advisory page: [link](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ssl-dos-kxG8mpUA)
- agent/type
- agent/first-publish-date
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/author
- agent/severity
- agent/last-modified-date
- agent/weakness
- agent/description
- agent/event
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- vendor/cisco
- canonical/cisco firepower threat defense
- version/cisco firepower threat defense/7.0.0
- version/cisco firepower threat defense/7.0.0.1
- version/cisco firepower threat defense/7.0.1
- version/cisco firepower threat defense/7.0.1.1
- version/cisco firepower threat defense/7.0.2
- version/cisco firepower threat defense/7.0.2.1
- version/cisco firepower threat defense/7.0.3
- version/cisco firepower threat defense/7.0.4
- version/cisco firepower threat defense/7.0.5
- version/cisco firepower threat defense/7.1.0
- version/cisco firepower threat defense/7.1.0.1
- version/cisco firepower threat defense/7.1.0.2
- version/cisco firepower threat defense/7.1.0.3
- version/cisco firepower threat defense/7.2.0
- version/cisco firepower threat defense/7.2.0.1
- version/cisco firepower threat defense/7.2.1
- version/cisco firepower threat defense/7.2.2
- version/cisco firepower threat defense/7.2.3
- version/cisco firepower threat defense/7.3.0
- version/cisco firepower threat defense/7.3.1
- version/cisco firepower threat defense/7.3.1.1
- canonical/cisco adaptive security appliance software
- version/cisco adaptive security appliance software/9.16.1
- version/cisco adaptive security appliance software/9.16.1.28
- version/cisco adaptive security appliance software/9.16.2
- version/cisco adaptive security appliance software/9.16.2.3
- version/cisco adaptive security appliance software/9.16.2.7
- version/cisco adaptive security appliance software/9.16.2.11
- version/cisco adaptive security appliance software/9.16.2.13
- version/cisco adaptive security appliance software/9.16.2.14
- version/cisco adaptive security appliance software/9.16.3
- version/cisco adaptive security appliance software/9.16.3.3
- version/cisco adaptive security appliance software/9.16.3.14
- version/cisco adaptive security appliance software/9.16.3.15
- version/cisco adaptive security appliance software/9.16.3.19
- version/cisco adaptive security appliance software/9.16.3.23
- version/cisco adaptive security appliance software/9.16.4
- version/cisco adaptive security appliance software/9.16.4.9
- version/cisco adaptive security appliance software/9.17.1
- version/cisco adaptive security appliance software/9.17.1.7
- version/cisco adaptive security appliance software/9.17.1.9
- version/cisco adaptive security appliance software/9.17.1.10
- version/cisco adaptive security appliance software/9.17.1.11
- version/cisco adaptive security appliance software/9.17.1.13
- version/cisco adaptive security appliance software/9.17.1.15
- version/cisco adaptive security appliance software/9.17.1.20
- version/cisco adaptive security appliance software/9.18.1
- version/cisco adaptive security appliance software/9.18.1.3
- version/cisco adaptive security appliance software/9.18.2
- version/cisco adaptive security appliance software/9.18.2.5
- version/cisco adaptive security appliance software/9.18.2.7
- version/cisco adaptive security appliance software/9.19.1