CVE-2023-33242Public exploitNetwork attack vector

Private-key extraction via repeated signature aborts

Published Aug 9, 2023 · Updated Oct 10, 2024

Private-key exfiltration in Lindell17 TSS wallets allows remote authenticated users to recover an ECDSA key through repeated signing. A malicious protocol party submits crafted Paillier ciphertexts whose signature validity reveals one private-key-share bit, while implementations continue after failed signatures instead of terminating. Compromise of one signing party and roughly 200 to 256 signing attempts expose the full key, enabling forged signatures and theft of wallet funds.

CVSS severity9.6
Critical
EPSS probability1.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Private-key exfiltration in Lindell17 TSS wallets allows remote authenticated users to recover an ECDSA key through repeated signing. A malicious protocol party submits crafted Paillier ciphertexts whose signature validity reveals one private-key-share bit, while implementations continue after failed signatures instead of terminating. Compromise of one signing party and roughly 200 to 256 signing attempts expose the full key, enabling forged signatures and theft of wallet funds.

The record

CVE
CVE-2023-33242
Published
Aug 9, 2023
Updated
Oct 10, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-74, CAPEC-474, T1552.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.6HalbornCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CAPEC-474Signature Spoofing by Key Theft
T1552.004Unsecured Credentials: Private Keys

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo