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CVE-2020-14359

19
FAUCET Score

CVE-2020-14359 describes a critical authentication bypass vulnerability in all versions of Keycloak Gatekeeper and Red Hat Louketo Proxy. An attacker can bypass the Gatekeeper by sending HTTP requests with lowercase headers, which some web servers like Jetty accept, leaving protected resources exposed. This vulnerability carries a CVSS score of 7.3 (HIGH) due to its network-based attack vector, low attack complexity, and potential for partial compromise of confidentiality, integrity, and availability. While no active exploitation, public exploit code, or significant community discussion has been observed, organizations using affected products should prioritize patching to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:redhat:louketo_proxy:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.93%
Probability of exploitation in next 30 days
EPSS Percentile
57.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0093 is in the 32nd percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatvendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

goGHSA-jh6m-3pqw-242hhigh

Keycloak Gatekeeper vulnerable to bypass on using lower case HTTP headers

Feb 9, 2022
redhatCVE-2020-14359Moderate

keycloak-gatekeeper: gatekeeper bypass via cURL when using lower case HTTP headers

Jan 19, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingVendor Advisory
issues.jboss.org / browse/KEYCLOAK-14090
Issue TrackingPermissions RequiredThird Party Advisory