CVE-2021-20034

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.1
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 81%
CISA-KEV: Not listedEPSS: 81%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal checks and delete an arbitrary file potentially resulting in a reboot to factory default settings.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
78(Track*)
EG Risk 78/100SSVC: 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
Severity91% × 45%
Exploitation81% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
99.6%
KEV
Not listed

Published

September 27, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

Security Advisory

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0021

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 23× 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.

  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-23 01:56 UTCEG score recompute
  3. 2026-07-22 22:43 UTCEG score recompute
  4. 2026-07-22 14:05 UTCEPSS rescore
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  1. 2026-06-21 01:58 UTCEPSS rescore
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  24. 2026-06-04 13:10 UTCEPSS rescore
  25. 2026-06-02 20:11 UTCEPSS rescore
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  27. 2026-06-01 13:50 UTCEPSS rescore
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  29. 2026-05-31 22:29 UTCEPSS rescore
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  31. 2026-05-31 00:15 UTCEPSS rescore
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  36. 2026-05-27 13:39 UTCEPSS rescore
  37. 2026-05-26 13:42 UTCEPSS rescore
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  39. 2026-05-24 16:49 UTCEPSS rescore
  40. 2026-05-23 08:26 UTCEG score recompute
  41. 2026-05-23 08:26 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-50430
    First seen Oct 20, 2021

    SonicWall SMA 10.2.1.0-17sv - Password Reset

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-20034?
CVE-2021-20034 is a critical vulnerability published on September 27, 2021. An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal checks and delete an arbitrary file potentially resulting in a reboot to factory default settings.
When was CVE-2021-20034 disclosed?
CVE-2021-20034 was first published in the National Vulnerability Database on September 27, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-20034 actively exploited?
CVE-2021-20034 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-20034?
CVE-2021-20034 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-20034?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20034, 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

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