CVE-2024-8948

HIGHNVD 7.37.3
EchelonGraph scoreMEDIUM confidence

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

Score 7.3 from GitHub Security Advisory published 2024-09-17. NVD baseline CVSS 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this weekElevated
7.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 7.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

A vulnerability was found in MicroPython 1.23.0. It has been rated as critical. Affected by this issue is the function mpz_as_bytes of the file py/objint.c. The manipulation leads to heap-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The patch is identified as 908ab1ceca15ee6fd0ef82ca4cba770a3ec41894. It is recommended to apply a patch to fix this issue. In micropython objint component, converting zero from int to bytes leads to heap buffer-overflow-write at mpz_as_bytes.

CVSS v3
7.3
EG Score
7.3HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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)
Severity73% × 45%
Impact severity (EG Severity): CVSS 7.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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 public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
1.0%
EPSS %ILE
62nd
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 (7.3): severity, escalated by confirmed exploitation. This CVE's 7.3 is its impact severity (EG Severity), not escalated.

EG Severity
7.3 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.0% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-18). 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: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: 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 public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

September 17, 2024

Last Modified

September 23, 2024

Advisory Details (2)

Auto-updated Oct 19, 2026
Patch available. Sources: github_commit.
Web page

heap-buffer-overflow: from 0 length int_to_bytes · Issue #13041 · micropython/micropython · GitHub

https://github.com/micropython/micropython/issues/13041
GitHub commit

commit 908ab1ceca15 (micropython/micropython)

Fix landed in micropython/micropython commit 908ab1ceca15 — awaiting tagged release

https://github.com/micropython/micropython/commit/908ab1ceca15ee6fd0ef82ca4cba770a3ec41894

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
pipmicropython-copy—ghsa
pipmicropython-io—ghsa
pipmicropython-os—ghsa

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.

Affected Packages

(5 across 3 ecosystems)
PyPI(3)
PackageVulnerable rangeFix by version rangeDependents
micropython-copy0.0.1, 0.0.2, 3.3.3-2, 3.3.3.post3
  • every version through 3.3.3.post3: no fix on record
  • every version on: no fix on record
—
micropython-io0.0.1, 0.0.2, 0.0.3, 0.1
  • every version through 0.1: no fix on record
  • every version on: no fix on record
—
micropython-os0.2.3 ... v1.0-rc1 (72 versions)
  • every version through 0.8: no fix on record
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
micropython—
  • every version up to 1.24.0+ds-1: fixed in 1.24.0+ds-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
micropython—
  • every version up to 1.24.0+ds-1: fixed in 1.24.0+ds-1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× 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 94 of 194 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. 6 repeat rows among the latest 100 are merged into the row they repeat. The 100 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-21 16:30 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
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  4. 2026-10-19 06:03 UTCEG score recompute
  5. 2026-10-19 06:03 UTCGHSA enrichmentGHSA-vh3x-525m-jp4r · GitHub CVSS 7.3
  6. 2026-10-18 16:30 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  7. 2026-10-18 05:55 UTCEG score recompute
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  1. 2026-10-04 23:21 UTCEPSS rescoreEPSS 1.0% · 61st percentile
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  12. 2026-09-20 07:13 UTCOSV refresh
  13. 2026-09-19 15:41 UTCEPSS rescoreEPSS 1.0% · 61st percentile
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  68. 2026-07-23 02:46 UTCEG score recompute
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Frequently asked(5)

What is CVE-2024-8948?
CVE-2024-8948 is a high-severity vulnerability; its CVE record was published on September 17, 2024. A vulnerability was found in MicroPython 1.23.0. It has been rated as critical. Affected by this issue is the function mpzasbytes of the file py/objint.c. The manipulation leads to heap-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may…
When was the CVE record for CVE-2024-8948 published?
The CVE record for CVE-2024-8948 was published on September 17, 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 September 23, 2024; the record at its source may have been updated since.
Is CVE-2024-8948 actively exploited?
CVE-2024-8948 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (62nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2024-8948?
CVE-2024-8948 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2024-8948?
A fix for CVE-2024-8948 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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