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CVE-2021-41592

29
FAUCET Score

CVE-2021-41592 is a critical vulnerability affecting Blockstream c-lightning versions up to 0.10.1, leading to potential loss of funds due to "dust HTLC exposure." With a CVSS score of 9.4 (CRITICAL), this vulnerability is easily exploitable over the network with low complexity and no user interaction, potentially impacting confidentiality, integrity, and availability. There is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.10.1CPE matchmatch criteria
cpe:2.3:a:elementsproject:c-lightning:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.4CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.50%
Probability of exploitation in next 30 days
EPSS Percentile
71.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0150 is in the 58th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

bitcoinmagazine.com / technical/good-griefing-a-lingering-vulnerability-on-lightning-network-that-still-needs-fixing
Press/Media CoverageThird Party Advisory
github.com / ElementsProject/lightning
Third Party Advisory
lists.linuxfoundation.org / pipermail/lightning-dev/2020-May/002714.html
Mailing ListVendor Advisory
lists.linuxfoundation.org / pipermail/lightning-dev/2021-October/003257.html
Mailing ListMitigationVendor Advisory
lists.linuxfoundation.org / pipermail/lightning-dev/2021-October/003264.html
Mailing ListVendor Advisory