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CVE-2020-8660

19
FAUCET Score

CVE-2020-8660 describes a TLS inspector bypass vulnerability in CNCF Envoy versions through 1.13.0. A client using only TLS 1.3 could bypass the TLS inspector, potentially leading to incorrect filter chain matching and circumvention of security restrictions. This vulnerability has a CVSS score of 5.3 (Medium), indicating it can be exploited over the network with low attack complexity, potentially leading to a partial loss of confidentiality. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.12.3CPE matchmatch criteria
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
>= 1.13.0, < 1.13.1CPE matchmatch criteria
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.61%
Probability of exploitation in next 30 days
EPSS Percentile
45.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0061 is in the 29th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: OpenShift Service Mesh 1.0Fixed in: servicemesh-proxy-0:1.0.9-2.el8
View patch

Vendor Advisories (1)

redhatCVE-2020-8660Moderate

envoy: TLS inspector bypassc

Mar 3, 2020

References

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