Partial secret key disclosure, improper safety number calculation, & inadequate encryption strength
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-319.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| parabirb | wrongthink | 2.0.0 to before 2.2.0 | 2.2.0 | Patch available | CNA |
- wrongthink Vendorparabirb Affected 2.0.0 to before 2.2.0 Fixed in 2.2.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:wrongthink:wrongthink:*:*:*:*:*:*:*:* | 2.0.0 to before 2.3.0 | Vulnerable | Wrongthink |
- cpe:2.3:a:wrongthink:wrongthink:*:*:*:*:*:*:*:* Versions 2.0.0 to before 2.3.0 Vulnerable ·Wrongthink
Remediation
- Fix · CNA wrongthink (parabirb) Fixed in 2.2.0
Timeline
- 2026-10-02 Threatist record created from CVE-2021-21387
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences