CVE-2021-39156— Fragments in Path May Lead to Authorization Policy Bypass
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2021-39156
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Fragments in Path May Lead to Authorization Policy Bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
D-Link DIR-816 A2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DIR-816 A2是中国台湾友讯（D-Link）公司的一款无线路由器。 D-Link DIR-816A2 存在安全漏洞，该漏洞源于通过goform form2userconfig.cgi route的handler函数中的HTTP request参数，发现了一个问题，可以构造用户名字符串来删除user函数。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-39156
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-39156
请登录查看更多情报信息。
- https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4rx_refsource_CONFIRM
- https://istio.io/latest/news/security/istio-security-2021-008x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-39156
IV. Related Vulnerabilities
Same product: istio
- CVE-2026-41413
Istio Vulnerable to SSRF via RequestAuthentication jwksUri - CVE-2026-39350
Istio AuthorizationPolicy Incorrect Regex Matching of Dots i - CVE-2026-31838
Istio HTTP debug endpoints on port 15014 to enforce namespac - CVE-2026-31837
Istio JWKS resolver to prevent private key material from bei - CVE-2022-39388
Istio may allow identity impersonation if user has localhost
Same vendor: istio
- CVE-2026-41413
Istio Vulnerable to SSRF via RequestAuthentication jwksUri - CVE-2026-39350
Istio AuthorizationPolicy Incorrect Regex Matching of Dots i - CVE-2026-31838
Istio HTTP debug endpoints on port 15014 to enforce namespac - CVE-2026-31837
Istio JWKS resolver to prevent private key material from bei - CVE-2022-39388
Istio may allow identity impersonation if user has localhost
Same weakness: CWE-863
- CVE-2025-10908
Account Lock Bypass via Magic Link or Pass Key Authenticatio - CVE-2026-42571
Privilege Escalation Attack affecting Pelican Web UI - CVE-2025-15633
HCL BigFix WebUI is affected by an improper authorization vu - CVE-2026-42296
Argo Workflows has incomplete fix for CVE-2026-31892: hostNe - CVE-2025-66170
Apache CloudStack: Any user can list backups that they shoul
V. Comments for CVE-2021-39156
No comments yet