CVE-2026-21109

LOWPre-NVD 2.12.1—
EchelonGraph scoreMEDIUM confidence

This low-severity CVE scores 2.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (below the 1st percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
2.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 2.1Exploit: None knownExposed services: Not assessed

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

Improper access control in Watch Plugin prior to Android Watch 17 allows local attackers to access sensitive information.

CVSS v3
2.1
EG Score
2.1LOWmedium confidence
EG Risk
9
EG Risk 9/100CISA SSVC

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
Severity21% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
below the 1st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 9, 2026

Last Modified

September 10, 2026

References (1)

Vendor Advisories for CVE-2026-21109(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 9× in last 7d / 38× 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. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-02 11:03 UTCEG score recompute
  3. 2026-10-02 11:03 UTCGHSA enrichment
  4. 2026-10-01 19:49 UTCEPSS rescore
  5. 2026-09-30 15:03 UTCEPSS rescore
  6. 2026-09-29 15:21 UTCEPSS rescore
  7. 2026-09-29 08:21 UTCEG score recompute
  8. 2026-09-29 08:21 UTCGHSA enrichment
  9. 2026-09-28 13:51 UTCEPSS rescore
  10. 2026-09-27 13:47 UTCEPSS rescore
  11. 2026-09-26 15:58 UTCEPSS rescore
  12. 2026-09-26 05:38 UTCEG score recompute
  13. 2026-09-26 05:38 UTCGHSA enrichment
  14. 2026-09-26 00:26 UTCEPSS rescore
  15. 2026-09-24 14:03 UTCEPSS rescore
  16. 2026-09-23 02:38 UTCEG score recompute
  17. 2026-09-23 02:38 UTCGHSA enrichment
  18. 2026-09-20 20:15 UTCEPSS rescore
  19. 2026-09-19 23:56 UTCEG score recompute
  20. 2026-09-19 23:56 UTCGHSA enrichment
  21. 2026-09-18 19:27 UTCEPSS rescore
  22. 2026-09-16 21:14 UTCEG score recompute
  23. 2026-09-16 21:14 UTCGHSA enrichment
  24. 2026-09-16 14:07 UTCEPSS rescore
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 13 more
  1. 2026-09-13 18:05 UTCEG score recompute
  2. 2026-09-13 18:05 UTCGHSA enrichment
  3. 2026-09-12 15:01 UTCEPSS rescore
  4. 2026-09-11 14:52 UTCEPSS rescore
  5. 2026-09-10 15:23 UTCEG score recompute
  6. 2026-09-10 15:23 UTCGHSA enrichment
  7. 2026-09-10 14:25 UTCEG score recompute
  8. 2026-09-10 14:25 UTCGHSA enrichment
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-09 15:50 UTCGHSA enrichment
  11. 2026-09-09 05:25 UTCEG score recompute
  12. 2026-09-09 04:55 UTCEG score recompute
  13. 2026-09-09 04:55 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-21109?
CVE-2026-21109 is a low vulnerability published on September 9, 2026. Improper access control in Watch Plugin prior to Android Watch 17 allows local attackers to access sensitive information.
When was CVE-2026-21109 disclosed?
CVE-2026-21109 was first published on September 9, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21109 actively exploited?
CVE-2026-21109 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (below the 1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-21109?
CVE-2026-21109 has a CVSS base score of 2.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-21109?
No fix for CVE-2026-21109 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-21109 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-21109

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