CVE-2026-71935

HIGHPre-NVD 7.27.2—
EchelonGraph scoreHIGH confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-24. a secondary CVSS source baseline 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.2Exploit: 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 buffer overflow vulnerability in the webBackupAction function. The vulnerability is caused by repeated string concatenation of the pathN, valueN, key, and option fields into fixed-size stack buffers without total length checks. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.

CVSS v3
7.2
EG Score
7.2(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity72% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 24, 2026
No patch confirmed yet.
generic

DrayTek VigorSwitch Multiple Models Buffer Overflow via webBackupAction | Advisories | VulnCheck

https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-webbackupaction
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-2026-71935(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 23× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 19:16 UTCGHSA enrichment
  3. 2026-08-29 07:03 UTCEG score recompute
  4. 2026-08-29 07:02 UTCGHSA enrichment
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 18:49 UTCGHSA enrichment
  7. 2026-08-28 06:24 UTCGHSA enrichment
  8. 2026-08-27 18:14 UTCEG score recompute
  9. 2026-08-27 18:14 UTCGHSA enrichment
  10. 2026-08-27 05:36 UTCGHSA enrichment
  11. 2026-08-26 17:23 UTCEG score recompute
  12. 2026-08-26 17:23 UTCGHSA enrichment
  13. 2026-08-26 14:47 UTCEPSS rescore
  14. 2026-08-26 07:55 UTCGHSA enrichment
  15. 2026-08-25 19:44 UTCEG score recompute
  16. 2026-08-25 19:44 UTCGHSA enrichment
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 07:34 UTCGHSA enrichment
  19. 2026-08-24 19:25 UTCEG score recompute
  20. 2026-08-24 19:24 UTCGHSA enrichment
  21. 2026-08-24 18:21 UTCEG score recompute
  22. 2026-08-24 17:21 UTCEG score recompute
  23. 2026-08-24 17:21 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-71935?
CVE-2026-71935 is a high vulnerability published on August 24, 2026. Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the webBackupAction function. The vulnerability is caused by repeated string concatenation of the pathN, valueN, key, and option fields into fixed-size stack buffers without total length checks. A remote attacker can…
When was CVE-2026-71935 disclosed?
CVE-2026-71935 was first published in the National Vulnerability Database on August 24, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71935 actively exploited?
CVE-2026-71935 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.8% of all scored CVEs.
What is the CVSS score of CVE-2026-71935?
CVE-2026-71935 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-71935?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71935, 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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