CVEvulnerability
CVE-2021-43557
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-11-22
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:P/I:N/A:N
- Weaknesses
- CWE-77
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.
Affected configurations
• apache apisix (< 2.10.2)
Related
Weakness · CWE (1)
- CWE-77 Improper Neutralization of Special Elements used in a Command weakness
References
- http://www.openwall.com/lists/oss-security/2021/11/22/1 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/22/2 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/23/1 Exploit, Mailing List, Third Party Advisory
- https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h Exploit, Mailing List, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2021/11/22/1 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/22/2 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/23/1 Exploit, Mailing List, Third Party Advisory
- https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h Exploit, Mailing List, Vendor Advisory