CVE-2021-25337

CRITICALNVD 4.49.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-11-08), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 4.4 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 3%CVSS: 4.4Exploit: cisa kev · ssvc activeExposed: 0

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

Improper access control in clipboard service in Samsung mobile devices prior to SMR Mar-2021 Release 1 allows untrusted applications to read or write certain local files.

CVSS v3
4.4
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: 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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
3%
EPSS %ILE
86%
KEV
⚠ Exploited

Published

March 4, 2021

Last Modified

October 30, 2025

Advisory Details (3)

Auto-updated Jun 15, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-25337
generic

Samsung Mobile Security

https://security.samsungmobile.com/securityUpdate.smsb
generic
https://security.samsungmobile.com

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 64× in last 7d / 270× 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 984 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2021-25337?
CVE-2021-25337 is a critical vulnerability published on March 4, 2021. Improper access control in clipboard service in Samsung mobile devices prior to SMR Mar-2021 Release 1 allows untrusted applications to read or write certain local files.
When was CVE-2021-25337 disclosed?
CVE-2021-25337 was first published in the National Vulnerability Database on March 4, 2021, with the most recent update on October 30, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-25337 actively exploited?
Yes. CISA added CVE-2021-25337 to the Known Exploited Vulnerabilities catalog on November 8, 2022, affecting Samsung Mobile Devices. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-25337?
CVE-2021-25337 has a CVSS v3 base score of 4.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-25337?
CVE-2021-25337 affects Samsung Mobile Devices. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-25337?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-25337, 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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