CVE-2021-32750: De-anonymization via message

Severity: medium (CVSS 5.7 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: yes
Published: 2021-07-15 · updated 2026-06-17
Weakness: CWE-200

Description

MuWire is a file publishing and networking tool that protects the identity of its users by using I2P technology. Users of MuWire desktop client prior to version 0.8.8 can be de-anonymized by an attacker who knows their full ID. An attacker could send a message with a subject line containing a URL with an HTML image tag and the MuWire client would try to fetch that image via clearnet, thus exposing the IP address of the user. The problem is fixed in MuWire 0.8.8. As a workaround, users can disable messaging functionality to prevent other users from sending them malicious messages.

Affected products

zlatinb muwire: before 0.8.8 — fixed in 0.8.8

How to fix

Upgrade to a fixed version: zlatinb muwire 0.8.8. Check the vendor advisory for mitigations.

References

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