CVE-2021-28235

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-04-04. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation2% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
73.3%
KEV
Not listed

Published

April 4, 2023

Last Modified

July 9, 2026

Advisory Details (5)

Auto-updated Jul 19, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

etcd-3.4.10-test/temp4cj_2.png at master · lucyxss/etcd-3.4.10-test · GitHub

https://github.com/lucyxss/etcd-3.4.10-test/blob/master/temp4cj_2.png
generic

etcd-3.4.10-test/temp4cj.png at master · lucyxss/etcd-3.4.10-test · GitHub

https://github.com/lucyxss/etcd-3.4.10-test/blob/master/temp4cj.png
github_pr

security: clear password after authenticating the user

Fix merged in etcd-io/etcd PR #15648 on 2023-04-06 — awaiting tagged release

https://github.com/etcd-io/etcd/pull/15648
generic

GitHub - etcd-io/etcd: Distributed reliable key-value store for the most critical data of a distributed system · GitHub

https://github.com/etcd-io/etcd
generic

💰 The Digital Core: Premium Domain ETCD.COM is Now Available - QUE.com

http://etcd.com

Vendor Advisories for CVE-2021-28235(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuetcd-client (3.4.23-4ubuntu0.1) @ lunar2026-05-25ubuntu
redhatetcd-0:3.3.23-14.el8ost2023-06-05redhat
redhatetcd-0:3.4.26-1.el9ost2023-06-05redhat
gogo.etcd.io/etcd/v3—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
go.etcd.io/etcd/v33.4.10——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 54× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-23 01:59 UTCEG score recompute
  2. 2026-07-22 22:46 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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  14. 2026-07-16 00:49 UTCOSV refresh
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  1. 2026-07-09 02:56 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  2. 2026-07-09 01:24 UTCMITRE cvelistV5
  3. 2026-07-08 15:12 UTCEPSS rescore
  4. 2026-07-07 13:43 UTCEPSS rescore
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  9. 2026-07-05 02:28 UTCEPSS rescore
  10. 2026-07-05 02:26 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  11. 2026-07-05 02:26 UTCMITRE cvelistV5
  12. 2026-07-04 06:29 UTCEPSS rescore
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  21. 2026-06-28 01:04 UTCOSV refresh
  22. 2026-06-27 03:06 UTCEPSS rescore
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  24. 2026-06-25 13:48 UTCEPSS rescore
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  46. 2026-06-10 11:47 UTCOSV refresh
  47. 2026-06-08 14:15 UTCEPSS rescore
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  75. 2026-05-25 03:51 UTCEG score recompute

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-28235?
CVE-2021-28235 is a critical vulnerability published on April 4, 2023. Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.
When was CVE-2021-28235 disclosed?
CVE-2021-28235 was first published in the National Vulnerability Database on April 4, 2023, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-28235 actively exploited?
CVE-2021-28235 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-28235?
CVE-2021-28235 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-28235?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-28235, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-28235

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