CVE-2021-28164
Authorization Before Parsing and Canonicalization in jetty
5.3
MEDIUM
CVSS 3.1
EPSS 93.5%
Description
In Eclipse Jetty 9.4.37.v20210219 to 9.4.38.v20210224, the default compliance mode allows requests with URIs that contain %2e or %2e%2e segments to access protected resources within the WEB-INF directory. For example a request to /context/%2e/WEB-INF/web.xml can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application.
How to fix CVE-2021-28164
To remediate CVE-2021-28164, upgrade the affected package to a fixed version below.
- —upgrade to 9.4.39-1 or later
- —upgrade to 9.4.39 or later
Is CVE-2021-28164 being exploited?
Likely — EPSS is 93.5%, placing CVE-2021-28164 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (2)
- from 0, < 9.4.39-1
- >= 9.4.37, < 9.4.39
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |