CVE-2021-47969

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-16. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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

Color Notes 1.4 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350,000 repeated characters and paste it twice into a new note to cause the application to stop responding.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA 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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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

May 16, 2026

Last Modified

May 18, 2026

Advisory Details (2)

Auto-updated May 16, 2026
🔬 Proof of concept available. No fix on record yet.
generic

Color Notes 1.4 Denial of Service via Long Character String | Advisories | VulnCheck

https://www.vulncheck.com/advisories/color-notes-denial-of-service-via-long-character-string
generic🟡 PoC Available

Color Notes 1.4 - Denial of Service (PoC) - iOS dos Exploit

https://www.exploit-db.com/exploits/49952

Vendor Advisories for CVE-2021-47969(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 8× in last 7d / 30× 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.

Showing the most recent 100 of 290 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:40 UTCEPSS rescore
  3. 2026-10-07 23:45 UTCEPSS rescore
  4. 2026-10-06 15:14 UTCEPSS rescore
  5. 2026-10-05 17:40 UTCEPSS rescore
  6. 2026-10-04 23:19 UTCEPSS rescore
  7. 2026-10-03 14:22 UTCEPSS rescore
  8. 2026-10-03 14:22 UTCEPSS rescore
  9. 2026-10-02 16:23 UTCEPSS rescore
  10. 2026-09-30 15:46 UTCEG score recompute
  11. 2026-09-30 15:00 UTCEPSS rescore
  12. 2026-09-29 15:15 UTCEPSS rescore
  13. 2026-09-28 13:47 UTCEPSS rescore
  14. 2026-09-26 15:54 UTCEPSS rescore
  15. 2026-09-26 00:21 UTCEPSS rescore
  16. 2026-09-24 14:00 UTCEPSS rescore
  17. 2026-09-24 14:00 UTCEPSS rescore
  18. 2026-09-23 13:45 UTCEPSS rescore
  19. 2026-09-22 14:44 UTCEPSS rescore
  20. 2026-09-21 20:28 UTCEPSS rescore
  21. 2026-09-20 20:13 UTCEPSS rescore
  22. 2026-09-19 15:38 UTCEPSS rescore
  23. 2026-09-18 19:24 UTCEPSS rescore
  24. 2026-09-17 19:23 UTCEPSS rescore
  25. 2026-09-16 14:05 UTCEPSS rescore
Show 75 more
  1. 2026-09-16 14:05 UTCEPSS rescore
  2. 2026-09-15 03:06 UTCEPSS rescore
  3. 2026-09-12 14:57 UTCEPSS rescore
  4. 2026-09-11 14:49 UTCEPSS rescore
  5. 2026-09-11 09:33 UTCEPSS rescore
  6. 2026-09-08 21:57 UTCEPSS rescore
  7. 2026-09-07 15:58 UTCEPSS rescore
  8. 2026-09-06 13:45 UTCEPSS rescore
  9. 2026-09-05 15:25 UTCEPSS rescore
  10. 2026-09-04 13:57 UTCEPSS rescore
  11. 2026-09-04 05:03 UTCEPSS rescore
  12. 2026-09-02 14:09 UTCEPSS rescore
  13. 2026-09-01 13:51 UTCEPSS rescore
  14. 2026-08-30 19:14 UTCEPSS rescore
  15. 2026-08-30 01:19 UTCEPSS rescore
  16. 2026-08-28 21:38 UTCEPSS rescore
  17. 2026-08-26 14:43 UTCEPSS rescore
  18. 2026-08-25 13:46 UTCEPSS rescore
  19. 2026-08-24 14:13 UTCEPSS rescore
  20. 2026-08-23 17:23 UTCEG score recompute
  21. 2026-08-23 17:23 UTCGHSA enrichment
  22. 2026-08-22 00:52 UTCEG score recompute
  23. 2026-08-22 00:52 UTCGHSA enrichment
  24. 2026-08-21 23:46 UTCEPSS rescore
  25. 2026-08-20 22:52 UTCEPSS rescore
  26. 2026-08-20 19:14 UTCEG score recompute
  27. 2026-08-20 19:14 UTCGHSA enrichment
  28. 2026-08-19 17:01 UTCEPSS rescore
  29. 2026-08-18 13:45 UTCEPSS rescore
  30. 2026-08-17 13:44 UTCEPSS rescore
  31. 2026-08-17 10:11 UTCEG score recompute
  32. 2026-08-17 10:11 UTCGHSA enrichment
  33. 2026-08-16 14:53 UTCEPSS rescore
  34. 2026-08-16 03:43 UTCEG score recompute
  35. 2026-08-16 03:43 UTCGHSA enrichment
  36. 2026-08-16 02:11 UTCEPSS rescore
  37. 2026-08-15 02:16 UTCEG score recompute
  38. 2026-08-15 02:16 UTCGHSA enrichment
  39. 2026-08-15 01:27 UTCEPSS rescore
  40. 2026-08-14 14:16 UTCGHSA enrichment
  41. 2026-08-14 02:16 UTCEG score recompute
  42. 2026-08-14 02:16 UTCGHSA enrichment
  43. 2026-08-13 21:57 UTCEPSS rescore
  44. 2026-08-13 02:43 UTCGHSA enrichment
  45. 2026-08-12 14:43 UTCEG score recompute
  46. 2026-08-12 14:43 UTCGHSA enrichment
  47. 2026-08-12 13:48 UTCEPSS rescore
  48. 2026-08-12 01:59 UTCGHSA enrichment
  49. 2026-08-11 13:58 UTCEG score recompute
  50. 2026-08-11 13:58 UTCGHSA enrichment
  51. 2026-08-11 13:38 UTCEPSS rescore
  52. 2026-08-11 01:57 UTCEG score recompute
  53. 2026-08-11 01:57 UTCGHSA enrichment
  54. 2026-08-10 13:57 UTCGHSA enrichment
  55. 2026-08-10 01:45 UTCEG score recompute
  56. 2026-08-10 01:45 UTCGHSA enrichment
  57. 2026-08-09 13:44 UTCEPSS rescore
  58. 2026-08-09 13:43 UTCGHSA enrichment
  59. 2026-08-09 01:43 UTCEG score recompute
  60. 2026-08-09 01:43 UTCGHSA enrichment
  61. 2026-08-08 16:34 UTCEPSS rescore
  62. 2026-08-08 09:44 UTCGHSA enrichment
  63. 2026-08-07 21:44 UTCEG score recompute
  64. 2026-08-07 21:44 UTCGHSA enrichment
  65. 2026-08-07 16:24 UTCEPSS rescore
  66. 2026-08-07 09:43 UTCGHSA enrichment
  67. 2026-08-06 21:28 UTCEG score recompute
  68. 2026-08-06 21:28 UTCGHSA enrichment
  69. 2026-08-06 13:44 UTCEPSS rescore
  70. 2026-08-06 09:28 UTCGHSA enrichment
  71. 2026-08-05 21:28 UTCEG score recompute
  72. 2026-08-05 21:28 UTCGHSA enrichment
  73. 2026-08-05 19:15 UTCEPSS rescore
  74. 2026-08-04 15:06 UTCEPSS rescore
  75. 2026-08-04 10:34 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-47969?
CVE-2021-47969 is a high vulnerability published on May 16, 2026. Color Notes 1.4 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350,000 repeated characters and paste it twice into a new note to cause the…
When was CVE-2021-47969 disclosed?
CVE-2021-47969 was first published on May 16, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47969 actively exploited?
CVE-2021-47969 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-47969?
CVE-2021-47969 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2021-47969?
No fix for CVE-2021-47969 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-2021-47969 are linked in the Vendor Advisories panel on this page.

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