CVE-2026-71921

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-24. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 0

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

Multiple DrayTek VigorSwitch models contain a pre-authentication command injection vulnerability in the setget.cgi interface. The vulnerability is caused by insufficient filtering of the pass field before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges.

CVSS v3
9.8
EG Score
9.8(high)
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%
Exploitation3% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
87%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 27, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
No patch confirmed yet.
generic

DrayTek VigorSwitch Multiple Models Pre-Authentication OS Command Injection via setget.cgi | Advisories | VulnCheck

https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-pre-authentication-os-command-injection-via-setget-cgi
generic

Multiple Vulnerabilities in VigorSwitch Series | DrayTek

https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/

Vendor Advisories for CVE-2026-71921(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 47× in last 7d / 47× 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. 2026-08-30 05:39 UTCGHSA enrichment
  2. 2026-08-30 01:37 UTCEG score recompute
  3. 2026-08-30 01:37 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-29 21:35 UTCGHSA enrichment
  6. 2026-08-29 17:33 UTCGHSA enrichment
  7. 2026-08-29 12:38 UTCGHSA enrichment
  8. 2026-08-29 08:33 UTCGHSA enrichment
  9. 2026-08-29 04:32 UTCGHSA enrichment
  10. 2026-08-29 00:22 UTCEG score recompute
  11. 2026-08-29 00:22 UTCGHSA enrichment
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-28 18:01 UTCGHSA enrichment
  14. 2026-08-28 13:50 UTCGHSA enrichment
  15. 2026-08-28 09:47 UTCGHSA enrichment
  16. 2026-08-28 05:43 UTCGHSA enrichment
  17. 2026-08-28 01:39 UTCGHSA enrichment
  18. 2026-08-27 21:38 UTCGHSA enrichment
  19. 2026-08-27 17:37 UTCEG score recompute
  20. 2026-08-27 17:37 UTCGHSA enrichment
  21. 2026-08-27 17:16 UTCEG score recompute
  22. 2026-08-27 17:15 UTCGHSA enrichment
  23. 2026-08-27 13:39 UTCGHSA enrichment
  24. 2026-08-27 09:36 UTCGHSA enrichment
  25. 2026-08-27 05:33 UTCGHSA enrichment
Show 22 more
  1. 2026-08-27 01:27 UTCGHSA enrichment
  2. 2026-08-26 21:25 UTCGHSA enrichment
  3. 2026-08-26 17:24 UTCEG score recompute
  4. 2026-08-26 17:24 UTCGHSA enrichment
  5. 2026-08-26 14:47 UTCEPSS rescore
  6. 2026-08-26 14:46 UTCGHSA enrichment
  7. 2026-08-26 10:44 UTCGHSA enrichment
  8. 2026-08-26 06:43 UTCGHSA enrichment
  9. 2026-08-26 02:41 UTCGHSA enrichment
  10. 2026-08-25 22:38 UTCGHSA enrichment
  11. 2026-08-25 18:36 UTCGHSA enrichment
  12. 2026-08-25 14:34 UTCEG score recompute
  13. 2026-08-25 14:34 UTCGHSA enrichment
  14. 2026-08-25 13:49 UTCEPSS rescore
  15. 2026-08-25 10:32 UTCGHSA enrichment
  16. 2026-08-25 06:30 UTCGHSA enrichment
  17. 2026-08-25 02:24 UTCGHSA enrichment
  18. 2026-08-24 22:23 UTCEG score recompute
  19. 2026-08-24 22:23 UTCGHSA enrichment
  20. 2026-08-24 18:22 UTCEG score recompute
  21. 2026-08-24 17:21 UTCEG score recompute
  22. 2026-08-24 17:21 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-71921?
CVE-2026-71921 is a critical vulnerability published on August 24, 2026. Multiple DrayTek VigorSwitch models contain a pre-authentication command injection vulnerability in the setget.cgi interface. The vulnerability is caused by insufficient filtering of the pass field before command execution. A remote attacker can trigger this vulnerability via crafted input to…
When was CVE-2026-71921 disclosed?
CVE-2026-71921 was first published in the National Vulnerability Database on August 24, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71921 actively exploited?
CVE-2026-71921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 12.6% of all scored CVEs.
What is the CVSS score of CVE-2026-71921?
CVE-2026-71921 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-71921?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71921, 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

Explore the affected products and dependency analysis for CVE-2026-71921

Explore →

Is Your Infrastructure Affected by CVE-2026-71921?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs