CVE-2023-33242: Crypto wallets implementing the Lindell17 TSS protocol might allow an attacker to extract the full ECDSA priva

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CRITICAL 9.6MITIGATE

CVE-2023-33242 is a critical-severity flaw (CVSS 9.6) affecting lindell17. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-74
Published	2023-08-09
Last modified	2026-06-17

Publisher (CNA): Halborn · Vendor: lindell17 project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-09 22:15 UTCPublished CVE record published
2026-06-17 06:01 UTCUpdated Record last modified

lindell17 project lindell17 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lindell17 || rpm -q lindell17 || lindell17 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-33242?

lindell17: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-33242 being exploited?

CVE-2023-33242 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-33242 affect?

CVE-2023-33242 affects lindell17. Severity is critical (CVSS 9.6). 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 proo

How urgent is CVE-2023-33242?

Priority 57/100. Critical severity; Public exploit reference

References

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