High severity7.5NVD Advisory· Published Nov 22, 2021· Updated Jun 17, 2026
CVE-2021-43557
CVE-2021-43557
Description
The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains "^/internal/", a URI like //internal/ can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer's custom plugin.
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Affected products
5- Range: <2.10.2
Patches
Vulnerability mechanics
References
4- www.openwall.com/lists/oss-security/2021/11/23/1nvdExploitMailing ListThird Party Advisory
- lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7hnvdExploitMailing ListVendor Advisory
- www.openwall.com/lists/oss-security/2021/11/22/1nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/11/22/2nvdMailing ListThird Party Advisory
News mentions
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