What is CVE-2021-39155?

CVE-2021-39155 is a high-severity vulnerability in Istio, classified under Improper Handling of Case Sensitivity. CVSS score: 8.3/10. Published 2021-08-24.

How severe is CVE-2021-39155?

High severity. CVSS v3 base score is 8.3 out of 10.

Is CVE-2021-39155 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Istio

CVE-2021-39155

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. According to [RFC 4343](https://datatracker.ietf.org/doc/html…

EPSS: 0.002 (38.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L.

Affected products

Istio — versions <= 1.9.8, >= 1.10.0, < 1.10.4, >= 1.11.0, < 1.11.1

Weakness classification (CWE)

CWE-178 — Improper Handling of Case Sensitivity

Public proof-of-concept exploits

runwhen-contrib/helm-charts

References

github.com/istio/istio/security/advisories/GHSA-7774-7vr3-cc8j (x_refsource_CONFIRM)
datatracker.ietf.org/doc/html/rfc4343 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-39155?: CVE-2021-39155 is a high-severity vulnerability in Istio, classified under Improper Handling of Case Sensitivity. CVSS score: 8.3/10. Published 2021-08-24.
How severe is CVE-2021-39155?: High severity. CVSS v3 base score is 8.3 out of 10.
Is CVE-2021-39155 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.