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
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

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
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

May 16, 2026

Last Modified

May 18, 2026

Advisory Details (2)

Auto-updated May 16, 2026
🔬 Proof of concept available. No patch confirmed 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 11× in last 7d / 71× 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 248 total refreshes for this CVE.

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

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 79.6% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47969, 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.

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