CVE-2023-33982

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-05-24 · updated 2026-06-17
Weakness: CWE-326

Description

Bramble Handshake Protocol (BHP) in Briar before 1.5.3 is not forward secure: eavesdroppers can decrypt network traffic between two accounts if they later compromise both accounts. NOTE: the eavesdropping is typically impractical because BHP runs over an encrypted session that uses the Tor hidden service protocol.

Affected products

Briarproject Briar: before 1.5.3 — fixed in 1.5.3

How to fix

Upgrade to a fixed version: Briarproject Briar 1.5.3. Check the vendor advisory for mitigations.

References

https://briarproject.org/news/2023-three-security-issues-found-and-fixed/
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_YuanmingSong.pdf
https://briarproject.org/news/2023-three-security-issues-found-and-fixed/
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_YuanmingSong.pdf

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