CVE-2021-33200

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
30.2%
KEV
Not listed

Published

May 27, 2021

Last Modified

November 21, 2024

References (14)

Vendor Advisories for CVE-2021-33200(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-lowlatency (5.11.0.22.23) @ hirsute2026-05-23ubuntu
ubuntulinux-image-lowlatency (5.8.0.59.64) @ groovy2026-05-23ubuntu
ubuntulinux-image-unsigned-5.11.0-1009-kvm (5.11.0-1009.9) @ hirsute2026-05-23ubuntu
ubuntulinux-modules-5.4.0-1041-kvm (5.4.0-1041.42) @ focal2026-05-23ubuntu
ubuntulinux-image-oem-20.04b (5.10.0.1029.30) @ focal2026-05-23ubuntu
ubuntuvlan-modules-4.15.0-151-generic-di (4.15.0-151.157~16.04.1) @ xenial2026-05-23ubuntu
ubuntulinux-image-raspi2-hwe-18.04 (5.4.0.1038.73) @ focal2026-05-23ubuntu
redhatkernel-0:4.18.0-348.el82021-11-09redhat
redhatkernel-rt-0:4.18.0-348.rt7.130.el82021-11-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 44× 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 02:01 UTCEG score recompute
  2. 2026-07-22 22:48 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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  16. 2026-07-13 06:10 UTCEPSS rescore
  17. 2026-07-13 03:37 UTCOSV refresh
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  1. 2026-07-06 02:21 UTCEPSS rescore
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  15. 2026-06-24 14:03 UTCEPSS rescore
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  17. 2026-06-24 13:02 UTCOSV refresh
  18. 2026-06-23 21:31 UTCEPSS rescore
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  20. 2026-06-22 14:24 UTCEPSS rescore
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  22. 2026-06-21 14:55 UTCEPSS rescore
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  25. 2026-06-19 19:24 UTCEPSS rescore
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  27. 2026-06-18 17:51 UTCEPSS rescore
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  38. 2026-06-11 13:58 UTCEPSS rescore
  39. 2026-06-10 22:16 UTCEPSS rescore
  40. 2026-06-10 13:20 UTCEPSS rescore
  41. 2026-06-08 14:15 UTCEPSS rescore
  42. 2026-06-08 14:15 UTCEPSS rescore
  43. 2026-06-07 17:46 UTCOSV refresh
  44. 2026-06-07 15:23 UTCEPSS rescore
  45. 2026-06-07 15:23 UTCEPSS rescore
  46. 2026-06-06 13:46 UTCEPSS rescore
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  50. 2026-06-05 06:09 UTCEPSS rescore
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  73. 2026-05-23 08:11 UTCEG score recompute
  74. 2026-05-23 08:11 UTCVendor advisory
  75. 2026-05-23 08:11 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-33200?
CVE-2021-33200 is a high vulnerability published on May 27, 2021. kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner…
When was CVE-2021-33200 disclosed?
CVE-2021-33200 was first published in the National Vulnerability Database on May 27, 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-2021-33200 actively exploited?
CVE-2021-33200 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-33200?
CVE-2021-33200 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-33200?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33200, 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.

Dependency Blast Radius

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