CVE-2023-33241

Name: CVE-2023-33241
Creator: NVD / NIST
Published: 2023-08-09T22:15:10.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.02%

Last modified Jun 17, 2026

CVE-2023-33241 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Crypto wallets implementing the GG18 or GG20 TSS protocol might allow an attacker to extract a full ECDSA private key by injecting a malicious pallier key and cheating in the range proof. Depending on the Beta parameters chosen in the protocol implementation, the attack might require 16 signatures or more fully exfiltrate the other parties' private key shares.. EPSS estimates a 1.02% chance of exploitation in the next 30 days.

Description

Crypto wallets implementing the GG18 or GG20 TSS protocol might allow an attacker to extract a full ECDSA private key by injecting a malicious pallier key and cheating in the range proof. Depending on the Beta parameters chosen in the protocol implementation, the attack might require 16 signatures or more fully exfiltrate the other parties' private key shares.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

1.02%

58.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Gg18 Project	Gg18	All versions
Gg20 Project	Gg20	All versions

References

https://eprint.iacr.org/2019/114.pdfExploit, Third Party Advisory
https://eprint.iacr.org/2020/540.pdfExploit, Third Party Advisory
https://github.com/fireblocks-labs/mpc-ecdsa-attacks-23Exploit
https://github.com/fireblocks-labs/safeheron-gg20-exploit-pocExploit
https://www.fireblocks.com/blog/gg18-and-gg20-paillier-key-vulnerability-technical-report/Third Party Advisory
https://eprint.iacr.org/2019/114.pdfExploit, Third Party Advisory
https://eprint.iacr.org/2020/540.pdfExploit, Third Party Advisory
https://github.com/fireblocks-labs/mpc-ecdsa-attacks-23Exploit
https://github.com/fireblocks-labs/safeheron-gg20-exploit-pocExploit
https://www.fireblocks.com/blog/gg18-and-gg20-paillier-key-vulnerability-technical-report/Third Party Advisory

Timeline

Published: Aug 9, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-33241?

How severe is CVE-2023-33241?

CVE-2023-33241 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.02% probability of exploitation in the next 30 days.

How do I fix CVE-2023-33241?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-33241?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST