A flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own. The highest threat from this vulnerability is to data confidentiality and integrity.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| io.undertow:undertow-core(Maven) | 2.1.0 | 2.1.6 | N/A |
| io.undertow:undertow-core(Maven) | 0 | 2.0.34 | N/A |
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