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CVE-2022-20737

HIGHCVSS 7.1/10EPSS 1.08%

Last modified

CVE-2022-20737 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. A vulnerability in the handler for HTTP authentication for resources accessed through the Clientless SSL VPN portal of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device or to obtain portions of process memory from an affected device. This vulnerability is due to insufficient bounds checking when parsing specific HTTP authentication messages. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

A vulnerability in the handler for HTTP authentication for resources accessed through the Clientless SSL VPN portal of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device or to obtain portions of process memory from an affected device. This vulnerability is due to insufficient bounds checking when parsing specific HTTP authentication messages. An attacker could exploit this vulnerability by sending malicious traffic to an affected device acting as a VPN Gateway. To send this malicious traffic, an attacker would need to control a web server that can be accessed through the Clientless SSL VPN portal. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition, or to retrieve bytes from the device process memory that may contain sensitive information.

Metrics

CVSS 3.1
7.1/10

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

EPSS Probability
1.08%

60.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software< 9.12.4.38
CiscoAdaptive Security Appliance Software>= 9.13.0, < 9.14.4
CiscoAdaptive Security Appliance Software>= 9.15.0, < 9.15.1.21
CiscoAdaptive Security Appliance Software>= 9.16.0, < 9.16.2.14
CiscoAdaptive Security Appliance Software>= 9.17.0, < 9.17.1.7

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2022-20737?
A vulnerability in the handler for HTTP authentication for resources accessed through the Clientless SSL VPN portal of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device or to obtain portions of process memory from an affected device. This vulnerability is due to insufficient bounds checking when parsing specific HTTP authentication messages. An attacker could exploit this vulnerability by sending malicious traffic to an affected device acting as a VPN Gateway. To send this malicious traffic, an attacker would need to control a web server that can be accessed through the Clientless SSL VPN portal. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition, or to retrieve bytes from the device process memory that may contain sensitive information.
How severe is CVE-2022-20737?
CVE-2022-20737 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.
How do I fix CVE-2022-20737?
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-2022-20737?

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

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Source: NVD / NIST