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CVE-2021-31920

MEDIUMCVSS 6.5/10EPSS 1.17%

Last modified

CVE-2021-31920 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.. EPSS estimates a 1.17% chance of exploitation in the next 30 days.

Description

Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.

Metrics

CVSS 3.1
6.5/10

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

EPSS Probability
1.17%

63.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
IstioIstio< 1.8.6
IstioIstio>= 1.9.0, < 1.9.5

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-31920?
Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.
How severe is CVE-2021-31920?
CVE-2021-31920 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.17% probability of exploitation in the next 30 days.
How do I fix CVE-2021-31920?
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-2021-31920?

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

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Source: NVD / NIST