CVE-2026-19821

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-14. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

A vulnerability was determined in Tenda AC12 15.03.06.23_multi_TD01. This vulnerability affects the function formSetRebootTimer of the file /goform/SetSysAutoRebbotCfg of the component httpd web management interface. This manipulation of the argument rebootTime causes buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

August 14, 2026

Last Modified

August 18, 2026

Advisory Details (2)

Auto-updated Aug 14, 2026
No patch confirmed yet.
generic

腾达(Tenda) 官方网站

https://www.tenda.com.cn/
generic

iot_bug/Tenda/AC12/4.md at main · lipenghai/iot_bug · GitHub

https://github.com/lipenghai/iot_bug/blob/main/Tenda/AC12/4.md

Vendor Advisories for CVE-2026-19821(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 34× in last 7d / 34× 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. 2026-08-21 01:41 UTCEG score recompute
  2. 2026-08-21 01:41 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 14:03 UTCGHSA enrichment
  5. 2026-08-20 01:54 UTCEG score recompute
  6. 2026-08-20 01:54 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-19 14:16 UTCGHSA enrichment
  9. 2026-08-19 02:39 UTCGHSA enrichment
  10. 2026-08-18 14:58 UTCEG score recompute
  11. 2026-08-18 14:58 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 02:20 UTCEG score recompute
  14. 2026-08-18 02:20 UTCGHSA enrichment
  15. 2026-08-18 02:19 UTCNVD updateCVSS v4 → 7.4
  16. 2026-08-18 02:16 UTCMITRE cvelistV5CVSS v4 → 8.7
  17. 2026-08-17 17:02 UTCEG score recompute
  18. 2026-08-17 17:02 UTCGHSA enrichment
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-17 05:24 UTCGHSA enrichment
  21. 2026-08-16 17:47 UTCEG score recompute
  22. 2026-08-16 17:47 UTCGHSA enrichment
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 06:09 UTCEG score recompute
  25. 2026-08-16 06:09 UTCGHSA enrichment
Show 9 more
  1. 2026-08-16 02:14 UTCEPSS rescore
  2. 2026-08-15 18:32 UTCGHSA enrichment
  3. 2026-08-15 06:54 UTCGHSA enrichment
  4. 2026-08-14 19:16 UTCEG score recompute
  5. 2026-08-14 19:16 UTCGHSA enrichment
  6. 2026-08-14 11:36 UTCEG score recompute
  7. 2026-08-14 11:36 UTCNVD updateCVSS v4 → 7.4
  8. 2026-08-14 11:09 UTCEG score recompute
  9. 2026-08-14 11:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-19821?
CVE-2026-19821 is a high vulnerability published on August 14, 2026. A vulnerability was determined in Tenda AC12 15.03.06.23multiTD01. This vulnerability affects the function formSetRebootTimer of the file /goform/SetSysAutoRebbotCfg of the component httpd web management interface. This manipulation of the argument rebootTime causes buffer overflow. The attack may…
When was CVE-2026-19821 disclosed?
CVE-2026-19821 was first published in the National Vulnerability Database on August 14, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19821 actively exploited?
CVE-2026-19821 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 61.3% of all scored CVEs.
What is the CVSS score of CVE-2026-19821?
CVE-2026-19821 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-19821?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19821, 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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