CVE-2021-43557: vulnerability in Apache APISIX
Path traversal in request_uri variable
Published · Updated
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8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 13%
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.
Affected products
Apache Software Foundation · Apache APISIXRelated CVEs — Apache APISIX
In the same product, most dangerous first.
CVE-2022-24112CRITICALapisix/batch-requests plugin allows overwriting the X-REAL-IP headerEPSS 96.1%KEVCVE-2020-13945—CVE-2020-13945EPSS 73.6%CVE-2022-29266—apisix/jwt-auth may leak secrets in error responseEPSS 8.1%CVE-2022-25757—Apache APISIX: the body_schema check in request-validation plugin can be bypassedEPSS 2.5%CVE-2024-32638MEDIUMApache APISIX: Forward-Auth Request SmugglingEPSS 1.1%CVE-2026-75005HIGHApache APISIX: Unauthenticated CPU-exhaustion DoSEPSS 0.7%