What is CVE-2021-21387?

CVE-2021-21387 is a high-severity vulnerability in Parabirb Wrongthink, classified under Cleartext Transmission of Sensitive Information. CVSS score: 8.1/10. Published 2021-03-19.

How severe is CVE-2021-21387?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Parabirb Wrongthink

CVE-2021-21387

Wrongthink peer-to-peer, end-to-end encrypted messenger with PeerJS and Axolotl ratchet. In wrongthink from version 2.0.0 and before 2.3.0 there was a set of vulnerabilities causing inadequate encryption strength. Part of the secret identity key was disclosed by the fingerprint used for connection. Additionally, the safety number was improperly calculated. It was computed using part of one of the public identity keys instead of being derived from both public identity keys. This caused issues in computing safety numbers which would potentially be exploitable in the real world. Additionally there was inadequate encryption strength due to use of 1024-bit DSA keys. These issues are all fixed in version 2.3.0.

EPSS: 0.004 (32.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Parabirb Wrongthink — versions >= 2.0.0, < 2.2.0
Wrongthink

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21387?: CVE-2021-21387 is a high-severity vulnerability in Parabirb Wrongthink, classified under Cleartext Transmission of Sensitive Information. CVSS score: 8.1/10. Published 2021-03-19.
How severe is CVE-2021-21387?: High severity. CVSS v3 base score is 8.1 out of 10.