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CVE-2021-41591

29
FAUCET Score

CVE-2021-41591 is a critical vulnerability affecting ACINQ Eclair versions prior to 0.6.3, leading to potential loss of funds due to "dust HTLC exposure." With a CVSS score of 9.4, this vulnerability is remotely exploitable with low attack complexity, allowing unauthorized access to sensitive information and high impact on integrity and availability. While the FAUCET Risk Score is 75/100, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.6.3CPE matchmatch criteria
cpe:2.3:a:acinq:eclair:*:*:*:*:*:*:*:*

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
1.65%
Probability of exploitation in next 30 days
EPSS Percentile
74.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0165 is in the 62nd 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

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

bitcoinmagazine.com / technical/good-griefing-a-lingering-vulnerability-on-lightning-network-that-still-needs-fixing
Press/Media Coverage
github.com / ACINQ/eclair/pull/1985
PatchThird 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
ExploitVendor Advisory