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TI-2021-19447 Aliases CVE-2021-43557GHSA-9wxc-375c-cvq2

Path traversal in request_uri variable

Priority MEDIUM 47CWE-77Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-77.

Summary

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.

Why it matters now

EPSS 0.13044 96th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache APISIX1.5 and later—No fix listedCNA
  • Apache APISIX VendorApache Affected 1.5 and later Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*before 2.10.2VulnerableApache
  • cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:* Versions before 2.10.2 Vulnerable ·Apache

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43557
  2. 2026-10-03 Alias added: GHSA-9wxc-375c-cvq2

References

Exploit 2

Advisory 2

  • TI-2022-08057 apisix/batch-requests plugin allows overwriting the X-REAL-IP header KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2020-10921 In Apache APISIX, the user enabled the Admin API and deleted the Admin API access IP… CVSS 3.1MEDIUM 6.5
  • TI-2026-24457 Apache APISIX: forward auth plugin allows header injection CVSS 3.1CRITICAL 9.1
  • TI-2022-09331 Apache APISIX: the body_schema check in request-validation plugin can be bypassed CVSS 3.1CRITICAL 9.8
  • TI-2026-52703 Apache APISIX: Unauthenticated CPU-exhaustion DoS CVSS 4.0HIGH 8.7
See all 28 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences