What’s Vulnerable › Vulnerabilities

CVE-2023-33242: Lindell17 TSS Abort Mishandling

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-08-09 · updated 2026-06-17
• Weakness: CWE-74

Description

Crypto wallets implementing the Lindell17 TSS protocol might allow an attacker to extract the full ECDSA private key by exfiltrating a single bit in every signature attempt (256 in total) because of not adhering to the paper's security proof's assumption regarding handling aborts after a failed signature.

Affected products

• Lindell17 Project Lindell17: all versions

References

• https://eprint.iacr.org/2017/552.pdf
• https://github.com/fireblocks-labs/mpc-ecdsa-attacks-23
• https://github.com/fireblocks-labs/zengo-lindell17-exploit-poc
• https://www.fireblocks.com/blog/lindell17-abort-vulnerability-technical-report/
• https://eprint.iacr.org/2017/552.pdf
• https://github.com/fireblocks-labs/mpc-ecdsa-attacks-23
• https://github.com/fireblocks-labs/zengo-lindell17-exploit-poc
• https://www.fireblocks.com/blog/lindell17-abort-vulnerability-technical-report/

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