HOMEVULNERABILITIESCVE-2020-8664
MEDIUM

CVE-2020-8664

CWE-287Published: March 4, 2020· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official Description

CNCF Envoy through 1.13.0 has incorrect Access Control when using SDS with Combined Validation Context. Using the same secret (e.g. trusted CA) across many resources together with the combined validation context could lead to the “static” part of the validation context to be not applied, even though it was visible in the active config dump.

NVD Source

Technical Analysis

CVE-2020-8664 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Vendors & Products

cncf1 product(s)
envoy
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://access.redhat.com/errata/RHSA-2020:0734
ADVISORYhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-3x9m-pgmg-xpx8
ADVISORYhttps://www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_history
ADVISORYhttps://access.redhat.com/errata/RHSA-2020:0734
ADVISORYhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-3x9m-pgmg-xpx8
ADVISORYhttps://www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_history

All References (6)

→
https://access.redhat.com/errata/RHSA-2020:0734Third Party Advisory
→
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3x9m-pgmg-xpx8Third Party Advisory
→
https://www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_historyRelease Notes · Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2020:0734Third Party Advisory
→
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3x9m-pgmg-xpx8Third Party Advisory
→
https://www.envoyproxy.io/docs/envoy/v1.13.1/intro/version_historyRelease Notes · Third Party Advisory

Quick Facts

CVE IDCVE-2020-8664
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-287
CISA KEVNo
Affected1 vendor(s)
PublishedMar 4, 2020

Related CVEs (CWE-287)

CVE-2021-39296
10.0
CVE-2021-21538
10.0
CVE-2019-16649
10.0
CVE-2019-12643
10.0
CVE-2020-15164
10.0
CVE-2025-63224
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-8664 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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