How severe is CVE-2021-41591?

CVE-2021-41591 has a CVSS 3.x base score of 9.4, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2021-41591 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41591?

CVE-2021-41591 affects Acinq Eclair. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41591?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-41591 published?

CVE-2021-41591 was published on 2021-10-04 and last updated on 2026-06-17.

CVE-2021-41591

CVE-2021-41591 is a critical-severity vulnerability in Acinq Eclair with a CVSS 3.x base score of 9.4. 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-770.

Key facts

Severity: Critical (CVSS 3.x base score 9.4)
CVSS v2: 7.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Acinq Eclair
Published: 2021-10-04
Last modified: 2026-06-17

Description

ACINQ Eclair before 0.6.3 allows loss of funds because of dust HTLC exposure.

Frequently asked questions

What is CVE-2021-41591?: ACINQ Eclair before 0.6.3 allows loss of funds because of dust HTLC exposure.
How severe is CVE-2021-41591?: CVE-2021-41591 has a CVSS 3.x base score of 9.4, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2021-41591 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41591?: CVE-2021-41591 affects Acinq Eclair. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41591?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-41591 published?: CVE-2021-41591 was published on 2021-10-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:acinq:eclair:*:*:*:*:*:*:*:*

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