Vulnerability Details : CVE-2021-39156

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.
Published 2021-08-24 23:15:10
Updated 2022-08-12 18:01:20
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2021-39156

Exploit prediction scoring system (EPSS) score for CVE-2021-39156

EPSS FAQ
0.14%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 50 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-39156

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
 MEDIUM AV:N/AC:L/Au:N/C:P/I:N/A:N
10.0
2.9
 NIST
7.5
 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.9
3.6
 NIST
8.1
 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
2.8
5.2
 GitHub, Inc.

CWE ids for CVE-2021-39156

  • The product uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere.
    Assigned by: nvd@nist.gov (Primary)
  • The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
    Assigned by: security-advisories@github.com (Secondary)

References for CVE-2021-39156

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