CVE-2020-8843

Name: CVE-2020-8843
Creator: NVD / NIST
Published: 2020-02-14T19:15:10.683+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 1.06%

Last modified Jun 17, 2026

CVE-2020-8843 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

Description

An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.

Metrics

CVSS 3.1

7.4/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

1.06%

60.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Istio	Istio	>= 1.3.0, <= 1.3.6

References

https://github.com/istio/istio/commits/masterPatch
https://istio.io/news/security/Vendor Advisory
https://istio.io/news/security/istio-security-2020-002/Vendor Advisory
https://github.com/istio/istio/commits/masterPatch
https://istio.io/news/security/Vendor Advisory
https://istio.io/news/security/istio-security-2020-002/Vendor Advisory

Timeline

Published: Feb 14, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8843?

How severe is CVE-2020-8843?

CVE-2020-8843 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8843?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8843?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST