CVE-2022-20737

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of service disruption.

Exploit odds

1.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2022-05-03 04:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:24 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.2% in the next 30 days (EPSS).
• Severity: 8.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2022-05-03 04:15 UTC

Last modified

2026-06-17 04:24 UTC

Exploit probability

1.2% · EPSS, next 30 days

Weakness

CWE-122

Record status

Modified

Affected

• Cisco Adaptive Security Appliance Software < 9.12.4.38
• Cisco Adaptive Security Appliance Software < 9.14.4
• Cisco Adaptive Security Appliance Software < 9.15.1.21
• Cisco Adaptive Security Appliance Software < 9.16.2.14
• Cisco Adaptive Security Appliance Software < 9.17.1.7

Attack profile CVSS 3.1 · 8.5

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2022-20737.md and follow it. Check whether this project is affected by CVE-2022-20737. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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