RCE in Apache Apisix
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…
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.146 (96.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Apache Apisix
- Apache Software Foundation Apisix — versions 1.5
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (Exploit, Mailing List, x_refsource_MISC, Vendor Advisory)
- security@apache.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@apache.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@apache.org (mailing-list, x_refsource_MLIST, Exploit, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-43557?
- CVE-2021-43557 is a high-severity vulnerability in Apache Apisix, classified under Command Injection. CVSS score: 7.5/10. Published 2021-11-22.
- How severe is CVE-2021-43557?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-43557 known to be exploited?
- 12 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.