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Vulnerability Details CVE-2021-43557

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.457
EPSS Ranking 97.4%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
Products affected by CVE-2021-43557
  • Apache » Apisix » Version: N/A
    cpe:2.3:a:apache:apisix:-
  • Apache » Apisix » Version: 0.2
    cpe:2.3:a:apache:apisix:0.2
  • Apache » Apisix » Version: 0.3
    cpe:2.3:a:apache:apisix:0.3
  • Apache » Apisix » Version: 0.3-1
    cpe:2.3:a:apache:apisix:0.3-1
  • Apache » Apisix » Version: 0.4.1
    cpe:2.3:a:apache:apisix:0.4.1
  • Apache » Apisix » Version: 0.5
    cpe:2.3:a:apache:apisix:0.5
  • Apache » Apisix » Version: 0.6rc0
    cpe:2.3:a:apache:apisix:0.6rc0
  • Apache » Apisix » Version: 0.7
    cpe:2.3:a:apache:apisix:0.7
  • Apache » Apisix » Version: 0.8
    cpe:2.3:a:apache:apisix:0.8
  • Apache » Apisix » Version: 0.9-
    cpe:2.3:a:apache:apisix:0.9-
  • Apache » Apisix » Version: 0.9rc1
    cpe:2.3:a:apache:apisix:0.9rc1
  • Apache » Apisix » Version: 1.0
    cpe:2.3:a:apache:apisix:1.0
  • Apache » Apisix » Version: 1.1
    cpe:2.3:a:apache:apisix:1.1
  • Apache » Apisix » Version: 1.2
    cpe:2.3:a:apache:apisix:1.2
  • Apache » Apisix » Version: 1.3
    cpe:2.3:a:apache:apisix:1.3
  • Apache » Apisix » Version: 1.4
    cpe:2.3:a:apache:apisix:1.4
  • Apache » Apisix » Version: 1.4.1
    cpe:2.3:a:apache:apisix:1.4.1
  • Apache » Apisix » Version: 1.5
    cpe:2.3:a:apache:apisix:1.5
  • Apache » Apisix » Version: 2.0
    cpe:2.3:a:apache:apisix:2.0
  • Apache » Apisix » Version: 2.1
    cpe:2.3:a:apache:apisix:2.1
  • Apache » Apisix » Version: 2.10.0
    cpe:2.3:a:apache:apisix:2.10.0
  • Apache » Apisix » Version: 2.10.1
    cpe:2.3:a:apache:apisix:2.10.1
  • Apache » Apisix » Version: 2.2
    cpe:2.3:a:apache:apisix:2.2
  • Apache » Apisix » Version: 2.3
    cpe:2.3:a:apache:apisix:2.3
  • Apache » Apisix » Version: 2.4
    cpe:2.3:a:apache:apisix:2.4
  • Apache » Apisix » Version: 2.5
    cpe:2.3:a:apache:apisix:2.5
  • Apache » Apisix » Version: 2.6
    cpe:2.3:a:apache:apisix:2.6
  • Apache » Apisix » Version: 2.7
    cpe:2.3:a:apache:apisix:2.7
  • Apache » Apisix » Version: 2.8
    cpe:2.3:a:apache:apisix:2.8
  • Apache » Apisix » Version: 2.9
    cpe:2.3:a:apache:apisix:2.9


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