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CVE-2021-28235

31
FAUCET Score

CVE-2021-28235 is a critical authentication vulnerability in Etcd-io v.3.4.10 that allows remote attackers to escalate privileges through the debug function. With a CVSS score of 9.8, this vulnerability presents a severe risk due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. Despite its critical severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
3.4.10CPE matchmatch criteria
cpe:2.3:a:etcd:etcd:3.4.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.60%
Probability of exploitation in next 30 days
EPSS Percentile
73.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0160 is in the 61st percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (14)

microsoftpatch availablevia msrc
Product: cbl2 etcd 3.5.4-6 on CBL Mariner 2.0Fixed in: 3.5.4-6
microsoftpatch availablevia msrc
Product: 19460-16823Fixed in: 3.5.4-6
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 16.2Fixed in: etcd-0:3.3.23-14.el8ost
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 17.0Fixed in: etcd-0:3.4.26-1.el9ost
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 16.1Fixed in: etcd-0:3.3.23-14.el8ost
View patch
redhatno patchvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/lokistack-gateway-rhel8
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift-security-profiles-operator-container
redhatno patchvia redhat_api
Product: Red Hat Storage 3Fixed in: etcd
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-docker-builder
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-etcd
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-machine-config-rhel9-operator
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-operator-sdk-rhel8
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: etcd3
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: etcd

Vendor Advisories (3)

microsoft2023-Apr/CVE-2021-28235Critical

Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.

Apr 11, 2023
goGHSA-gmph-wf7j-9gcmcritical

Etcd-io Improper Authentication vulnerability

Apr 4, 2023
redhatCVE-2021-28235Important

etcd: Information discosure via debug function

Apr 4, 2023

References

github.com / etcd-io/etcd
Product
github.com / etcd-io/etcd/pull/15648
github.com / lucyxss/etcd-3.4.10-test/blob/master/temp4cj_2.png
Product
github.com / lucyxss/etcd-3.4.10-test/blob/master/temp4cj.png
Product