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Fencer Vulns
critical 9.6

CVE-2023-33241 json

GG18 / GG20 TSS Beta Parameter Vulnerability

published 2023-08-09 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-37410

cvss
9.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

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.

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/fireblocks-labs/mpc-ecdsa-attacks-23 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/fireblocks-labs/safeheron-gg20-exploit-poc referenced PoC, tagged "exploit" by a source, unverified
  • eprint.iacr.org https://eprint.iacr.org/2019/114.pdf referenced PoC, tagged "exploit" by a source, unverified
  • eprint.iacr.org https://eprint.iacr.org/2020/540.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

  • GG TSS Implementations Wallet

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.