CVSS v3
7.5
HIGH
EPSS Score
58.3%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
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.
Active exploitation of CVE-2021-43557 has not been confirmed. The EPSS score is 58.3%, indicating the estimated probability of exploitation in the next 30 days.
CVE-2021-43557 has a CVSS v3 base score of 7.5 (HIGH severity).
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Ranked by exploit probability (EPSS).