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CVE-2020-16844

MEDIUMCVSS 6.8/10EPSS 1.09%

Last modified

CVE-2020-16844 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy.. EPSS estimates a 1.09% chance of exploitation in the next 30 days.

Description

In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy.

Metrics

CVSS 3.1
6.8/10

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

EPSS Probability
1.09%

61.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
IstioIstio>= 1.5.0, <= 1.5.8
IstioIstio>= 1.6.0, <= 1.6.7

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-16844?
In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy.
How severe is CVE-2020-16844?
CVE-2020-16844 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.
How do I fix CVE-2020-16844?
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-2020-16844?

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

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Source: NVD / NIST