How severe is CVE-2021-41592?

CVE-2021-41592 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-2021-41592 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41592?

CVE-2021-41592 affects Elementsproject C-lightning. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41592?

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-2021-41592 published?

CVE-2021-41592 was published on 2021-10-04 and last updated on 2026-06-17.

CVE-2021-41592

CVE-2021-41592 is a critical-severity vulnerability in Elementsproject C-lightning 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: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Elementsproject C-lightning
Published: 2021-10-04
Last modified: 2026-06-17

Description

Blockstream c-lightning through 0.10.1 allows loss of funds because of dust HTLC exposure.

Frequently asked questions

What is CVE-2021-41592?: Blockstream c-lightning through 0.10.1 allows loss of funds because of dust HTLC exposure.
How severe is CVE-2021-41592?: CVE-2021-41592 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-2021-41592 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41592?: CVE-2021-41592 affects Elementsproject C-lightning. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41592?: 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-2021-41592 published?: CVE-2021-41592 was published on 2021-10-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:elementsproject:c-lightning:*:*:*:*:*:*:*:*

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