TI-2023-16849 Aliases CVE-2023-33982 GHSA-f7g9-f9cq-4whw

Bramble Handshake Protocol (BHP) in Briar before 1.5.3 is not forward secure…

LOW 27CWE-326Published 2023-05-24 · Updated 2025-01-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-326.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00457 39th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:briarproject:briar::::::::	before 1.5.3	Vulnerable	Briarproject

cpe:2.3:a:briarproject:briar:*:*:*:*:*:*:*:* Versions before 1.5.3 Vulnerable ·Briarproject

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2023-33982
2026-10-03 Alias added: GHSA-f7g9-f9cq-4whw

References

Exploit 1

https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_YuanmingSong.pdf

Advisory 1

https://briarproject.org/news/2023-three-security-issues-found-and-fixed/

TI-2023-16847 Bramble Synchronisation Protocol (BSP) in Briar before 1.4.22 allows attackers to cause a… CVSS 3.1HIGH 7.5
TI-2023-16850 The Introduction Client in Briar through 1.5.3 does not implement out-of-band… CVSS 3.1HIGH 7.4
TI-2023-16848 Briar before 1.4.22 allows attackers to spoof other users' messages in a blog, forum, or… CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences