CVE-2021-29251

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-04-01 · updated 2026-06-17

Description

BTCPay Server before 1.0.7.1 mishandles the policy setting in which users can register (in Server Settings > Policies). This affects Docker use cases in which a mail server is configured.

Affected products

btcpayserver/btcpayserver: before 1.0.7.1 — fixed in 1.0.7.1

How to fix

Upgrade to a fixed version: btcpayserver/btcpayserver 1.0.7.1. Check the vendor advisory for mitigations.

References

https://blog.btcpayserver.org/vulnerability-disclosure-v1-0-7-0/
https://github.com/btcpayserver/btcpayserver/releases/tag/v1.0.7.1
https://blog.btcpayserver.org/vulnerability-disclosure-v1-0-7-0/
https://github.com/btcpayserver/btcpayserver/releases/tag/v1.0.7.1

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