CVE-2021-32845

HIGHNVD 7.77.8▲
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2023-02-18. NVD baseline CVSS 7.7; sources differ by 0.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.7Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, the implementation of qnotify at pci_vtrnd_notify fails to check the return value of vq_getchain. This leads to struct iovec iov; being uninitialized and used to read memory in len = (int) read(sc->vrsc_fd, iov.iov_base, iov.iov_len); when an attacker is able to make vq_getchain fail. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit 41272a980197917df8e58ff90642d14dec8fe948.

CVSS v3
7.7
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100CISA 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.3%
EPSS %ILE
15th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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

February 17, 2023

Last Modified

November 21, 2024

References (3)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 30× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 87 of 177 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 13 repeat rows among the latest 100 are merged into the row they repeat. The 90 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-10 19:56 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  2. 2026-10-09 20:04 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  3. 2026-10-08 16:39 UTCEPSS rescoreEPSS 0.3% · 14th percentile
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  10. 2026-09-30 15:36 UTCEG score recompute
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  18. 2026-09-23 20:41 UTCOSV refresh
  19. 2026-09-23 13:44 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  1. 2026-09-16 14:05 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  8. 2026-09-07 15:58 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  10. 2026-09-05 15:25 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  11. 2026-09-04 14:59 UTCOSV refresh
  12. 2026-09-04 13:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  28. 2026-08-18 13:45 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  29. 2026-08-18 02:22 UTCOSV refresh
  30. 2026-08-17 13:44 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  45. 2026-08-02 20:57 UTCOSV refresh
  46. 2026-08-02 02:24 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  55. 2026-07-23 02:01 UTCEG score recompute
  56. 2026-07-22 22:48 UTCEG score recompute
  57. 2026-07-22 14:06 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  62. 2026-07-18 10:02 UTCEPSS rescoreEPSS 0.3% · 16th percentile

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Frequently asked(5)

What is CVE-2021-32845?
CVE-2021-32845 is a high vulnerability published on February 17, 2023. HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, the implementation of qnotify at pcivtrndnotify fails to check the return value of vqgetchain. This leads to struct iovec iov; being uninitialized and used to read memory in…
When was the CVE record for CVE-2021-32845 published?
The CVE record for CVE-2021-32845 was published on February 17, 2023. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2021-32845 actively exploited?
CVE-2021-32845 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-32845?
CVE-2021-32845 has a CVSS v3 base score of 7.7 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.8 (HIGH).
How do I remediate CVE-2021-32845?
A fix for CVE-2021-32845 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

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