CVE-2021-47091

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2024-03-04. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

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

In the Linux kernel, the following vulnerability has been resolved:

mac80211: fix locking in ieee80211_start_ap error path

We need to hold the local->mtx to release the channel context, as even encoded by the lockdep_assert_held() there. Fix it.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
6.5%
KEV
Not listed

Published

March 4, 2024

Last Modified

February 3, 2025

References (6)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 47× 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.

  1. 2026-07-23 02:06 UTCEG score recompute
  2. 2026-07-22 22:52 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
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  16. 2026-07-14 17:55 UTCOSV refresh
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  1. 2026-07-06 16:25 UTCEPSS rescore
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  16. 2026-06-26 18:39 UTCOSV refresh
  17. 2026-06-25 13:48 UTCEPSS rescore
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  40. 2026-06-11 13:58 UTCEPSS rescore
  41. 2026-06-10 22:16 UTCEPSS rescore
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  43. 2026-06-09 03:00 UTCOSV refresh
  44. 2026-06-08 14:15 UTCEPSS rescore
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  47. 2026-06-07 15:23 UTCEPSS rescore
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  71. 2026-05-26 07:17 UTCEPSS rescore
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  73. 2026-05-24 07:17 UTCEG score recompute
  74. 2026-05-24 07:17 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-47091?
CVE-2021-47091 is a medium vulnerability published on March 4, 2024. In the Linux kernel, the following vulnerability has been resolved: mac80211: fix locking in ieee80211startap error path We need to hold the local->mtx to release the channel context, as even encoded by the lockdepassertheld() there. Fix it.
When was CVE-2021-47091 disclosed?
CVE-2021-47091 was first published in the National Vulnerability Database on March 4, 2024, with the most recent update on February 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47091 actively exploited?
CVE-2021-47091 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-47091?
CVE-2021-47091 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2021-47091?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47091, 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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