CVE-2021-39296

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 3.0% (86th 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
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.0%CVSS: 10.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In OpenBMC 2.9, crafted IPMI messages allow an attacker to bypass authentication and gain full control of the system.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
51
EG Risk 51/100CISA 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
Severity100% × 45%
Exploitation3% × 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
3.0%
EPSS %ILE
86th
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

September 9, 2021

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Oct 3, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

INTEL-SA-00737

https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00737.html
generic

GitHub - openbmc/openbmc: OpenBMC Distribution · GitHub

https://github.com/openbmc/openbmc
github Patch Available🟡 PoC Available

OpenBMC: remote code execution in netipmid · Advisory · google/security-research · GitHub

https://github.com/google/security-research/security/advisories/GHSA-gg9x-v835-m48q

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 178 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2021-39296?
CVE-2021-39296 is a critical vulnerability published on September 9, 2021. In OpenBMC 2.9, crafted IPMI messages allow an attacker to bypass authentication and gain full control of the system.
When was CVE-2021-39296 disclosed?
CVE-2021-39296 was first published on September 9, 2021, 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-2021-39296 actively exploited?
CVE-2021-39296 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% probability of exploitation in the next 30 days (86th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-39296?
CVE-2021-39296 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2021-39296?
A fix for CVE-2021-39296 is available: update to the fixed version the vendor names in its advisory.

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