CVE-2020-12886

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 1.4% (70th 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, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP packet header starting from the message token. The length of the token in the received message is provided in the first byte parsed by the sn_coap_parser_options_parse() function. The length encoded in the message is not validated against the actual input buffer length before accessing the token. As a result, memory access outside of the intended boundary of the buffer may occur.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
46
EG Risk 46/100CISA 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
Severity91% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.4%
EPSS %ILE
70th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). 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

June 18, 2020

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jul 20, 2026
Patch available. Sources: github_pr.
generic

Out of range memory access in MbedOS CoAP library parser - token length not validated · Issue #12948 · ARMmbed/mbed-os · GitHub

https://github.com/ARMmbed/mbed-os/issues/12948
github_pr Patch Available

Bugfix/coap parser mem access bugs

Patch available: ARMmbed/mbed-coap v5.1.8 (PR #116 merged 2020-06-22)

https://github.com/ARMmbed/mbed-coap/pull/116

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 22× 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 158 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-12886?
CVE-2020-12886 is a critical vulnerability published on June 18, 2020. A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sncoapparseroptionsparse() parses the CoAP packet header starting from the message token. The length of the token in the received message is…
When was CVE-2020-12886 disclosed?
CVE-2020-12886 was first published on June 18, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-12886 actively exploited?
CVE-2020-12886 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (70th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-12886?
CVE-2020-12886 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2020-12886?
A fix for CVE-2020-12886 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2020-12886

Explore →

Is Your Infrastructure Affected by CVE-2020-12886?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs