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CVE-2018-1000851

31
FAUCET Score

CVE-2018-1000851 is a critical vulnerability affecting Copay Bitcoin Wallet versions 5.0.1 to 5.1.0, where an "Other/Unknown" flaw in private key storage allows for compromise of user private keys. With a CVSS score of 9.8 (CRITICAL), this vulnerability is remotely exploitable with low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community discussion, indicating awareness. The issue was resolved in Copay Bitcoin Wallet version 5.2.0 and later.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.0.1, <= 5.1.0CPE matchmatch criteria
cpe:2.3:a:copay:copay_bitcoin_wallet:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.24%
Probability of exploitation in next 30 days
EPSS Percentile
81.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0224 is in the 70th percentile among its peer group of 36,862 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

arstechnica.com / information-technology/2018/11/hacker-backdoors-widely-used-open-source-software-to-steal-bitcoin
Third Party Advisory
blog.bitpay.com / npm-package-vulnerability-copay
Third Party Advisory
github.com / bitpay/copay/issues/9346
ExploitIssue TrackingPatchThird Party Advisory
github.com / dominictarr/event-stream/issues/116
ExploitIssue TrackingPatchThird Party Advisory