CVE-2024-43378

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.1% (2nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2024-40256 (ENISA EUVD)Source: ENISA EUVD

7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

calamares-nixos-extensions provides Calamares branding and modules for NixOS, a distribution of GNU/Linux. Users who installed NixOS through the graphical installer who used manual disk partitioning to create a setup where the system was booted via legacy BIOS rather than UEFI; some disk partitions are encrypted; but the partitions containing either / or /boot are unencrypted; have their LUKS disk encryption key file in plain text either in /crypto_keyfile.bin, or in a CPIO archive attached to their NixOS initrd. nixos-install is not affected, nor are UEFI installations, nor was the default automatic partitioning configuration on legacy BIOS systems. The problem has been fixed in calamares-nixos-extensions 0.3.17, which was included in NixOS. The current installer images for the NixOS 24.05 and unstable (24.11) channels are unaffected. The fix reached 24.05 at 2024-08-13 20:06:59 UTC, and unstable at 2024-08-15 09:00:20 UTC. Installer images downloaded before those times may be vulnerable. The best solution for affected users is probably to back up their data and do a complete reinstallation. However, the mitigation procedure in GHSA-3rvf-24q2-24ww should work solely for the case where / is encrypted but /boot is not. If / is unencrypted, then the /crypto_keyfile.bin file will need to be deleted in addition to the remediation steps in the previous advisory. This issue is a partial regression of CVE-2023-36476 / GHSA-3rvf-24q2-24ww, which was more severe as it applied to the default configuration on BIOS systems.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 16, 2024

Last Modified

April 15, 2026

Advisory Details (5)

Auto-updated Sep 26, 2026
Patch available. Sources: github_pr, github.
GitHub pull request

[Backport release-24.05] calamares: 3.3.8, calamares-nixos-extensions: 0.3.18

Fix merged in NixOS/nixpkgs PR #334252 on 2024-08-12 — awaiting tagged release

https://github.com/NixOS/nixpkgs/pull/334252
GitHub pull request

calamares: 3.3.8, calamares-nixos-extensions: 0.3.18

Fix merged in NixOS/nixpkgs PR #331607 on 2024-08-12 — awaiting tagged release

https://github.com/NixOS/nixpkgs/pull/331607
GitHub advisoryMentions a patch (unverified)

calamares-nixos-extensions LUKS keyfile exposure regression on legacy BIOS systems · Advisory · NixOS/calamares-nixos-extensions · GitHub

https://github.com/NixOS/calamares-nixos-extensions/security/advisories/GHSA-vfxf-gpmj-2p25
GitHub advisoryMentions a patch (unverified)

`calamares-nixos-extensions` LUKS keyfile exposure · Advisory · NixOS/calamares-nixos-extensions · GitHub

https://github.com/NixOS/calamares-nixos-extensions/security/advisories/GHSA-3rvf-24q2-24ww
GitHub pull request Patch Available

Fix `crypto_keyfile.bin` creation condition

Patch available: NixOS/calamares-nixos-extensions 0.3.22 (PR #43 merged 2024-08-03)

https://github.com/NixOS/calamares-nixos-extensions/pull/43

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 36× 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 96 of 210 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. 4 repeat rows among the latest 100 are merged into the row they repeat. The 114 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-10-29 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-10-28 16:29 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-10-27 21:15 UTCEG score recompute
  6. 2026-10-27 16:29 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-25 17:03 UTCEG score recompute
  9. 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-10-24 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
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  12. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
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  14. 2026-10-20 19:24 UTCEG score recompute
  15. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-10-18 07:02 UTCEG score recompute
  19. 2026-10-17 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-10-16 16:36 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
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  23. 2026-10-13 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  24. 2026-10-12 17:46 UTCEG score recompute
  25. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
Show 71 more
  1. 2026-10-11 21:12 UTCEG score recompute
  2. 2026-10-11 16:04 UTCEG score recompute
  3. 2026-10-11 13:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-10-08 17:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-07 09:35 UTCOSV refresh
  9. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  12. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-09-30 19:52 UTCEG score recompute
  14. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-09-27 13:44 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-09-26 15:57 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  24. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-09-17 15:20 UTCOSV refresh
  26. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  27. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  28. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  29. 2026-09-12 14:59 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  30. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  31. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  37. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  38. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  39. 2026-08-29 15:43 UTCOSV refresh
  40. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  42. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
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  47. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  48. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  50. 2026-08-16 14:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  53. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  54. 2026-08-13 03:13 UTCOSV refresh
  55. 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  70. 2026-07-28 15:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  71. 2026-07-28 11:20 UTCOSV refresh

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Frequently asked(5)

What is CVE-2024-43378?
CVE-2024-43378 is a high-severity vulnerability; its CVE record was published on August 16, 2024. calamares-nixos-extensions provides Calamares branding and modules for NixOS, a distribution of GNU/Linux. Users who installed NixOS through the graphical installer who used manual disk partitioning to create a setup where the system was booted via legacy BIOS rather than UEFI; some disk partitions…
When was the CVE record for CVE-2024-43378 published?
The CVE record for CVE-2024-43378 was published on August 16, 2024. 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 April 15, 2026; the record at its source may have been updated since.
Is CVE-2024-43378 actively exploited?
CVE-2024-43378 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2024-43378?
CVE-2024-43378 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2024-43378?
A fix for CVE-2024-43378 is available: update to the fixed version the vendor names in its advisory.

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