CVE-2020-8660

Name: CVE-2020-8660
Creator: NVD / NIST
Published: 2020-03-04T22:15:11.343+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.61%

Last modified Jun 17, 2026

CVE-2020-8660 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. CNCF Envoy through 1.13.0 TLS inspector bypass. TLS inspector could have been bypassed (not recognized as a TLS client) by a client using only TLS 1.3. EPSS estimates a 0.61% chance of exploitation in the next 30 days.

Description

CNCF Envoy through 1.13.0 TLS inspector bypass. TLS inspector could have been bypassed (not recognized as a TLS client) by a client using only TLS 1.3. Because TLS extensions (SNI, ALPN) were not inspected, those connections might have been matched to a wrong filter chain, possibly bypassing some security restrictions in the process.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.61%

44.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-345

Affected Software

Vendor	Product	Versions
Envoyproxy	Envoy	< 1.12.3
Envoyproxy	Envoy	>= 1.13.0, < 1.13.1

References

https://access.redhat.com/errata/RHSA-2020:0734Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-c4g8-7grc-5wvxThird Party Advisory
https://www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_historyVendor Advisory
https://access.redhat.com/errata/RHSA-2020:0734Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-c4g8-7grc-5wvxThird Party Advisory
https://www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_historyVendor Advisory

Timeline

Published: Mar 4, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8660?

How severe is CVE-2020-8660?

CVE-2020-8660 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.61% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8660?

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-2020-8660?

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

Scan your code now

Source: NVD / NIST