How severe is CVE-2024-11991?

CVE-2024-11991 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2024-11991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-11991?

CVE-2024-11991 affects Dfinity Motoko. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-11991?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-11991 have an EU (EUVD) identifier?

Yes. CVE-2024-11991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-34242.

When was CVE-2024-11991 published?

CVE-2024-11991 was published on 2024-12-09 and last updated on 2026-06-17.

CVE-2024-11991

CVE-2024-11991 is a medium-severity vulnerability in Dfinity Motoko with a CVSS 3.x base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-908.

Key facts

Severity: Medium (CVSS 3.x base score 5.6)
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-34242
Weakness: CWE-908
Affected product: Dfinity Motoko
Published: 2024-12-09
Last modified: 2026-06-17

Description

Motoko's incremental garbage collector is impacted by an uninitialized memory access bug, caused by incorrect use of write barriers in a few locations. This vulnerability could potentially allow unauthorized read or write access to a Canister's memory. However, exploiting this bug requires the Canister to enable the incremental garbage collector or enhanced orthogonal persistence, which are non-default features in Motoko.

Frequently asked questions

What is CVE-2024-11991?: Motoko's incremental garbage collector is impacted by an uninitialized memory access bug, caused by incorrect use of write barriers in a few locations. This vulnerability could potentially allow unauthorized read or write access to a Canister's memory. However, exploiting this bug requires the Canister to enable the incremental garbage collector or enhanced orthogonal persistence, which are non-default features in Motoko.
How severe is CVE-2024-11991?: CVE-2024-11991 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2024-11991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-11991?: CVE-2024-11991 affects Dfinity Motoko. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-11991?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-11991 have an EU (EUVD) identifier?: Yes. CVE-2024-11991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-34242.
When was CVE-2024-11991 published?: CVE-2024-11991 was published on 2024-12-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:dfinity:motoko:*:*:*:*:*:*:*:*

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