CVE-2022-47930Network attack vector

Authentication bypass via session-unbound Schnorr challenges

Published Apr 21, 2023 · Updated Feb 5, 2025

Authentication bypass in IO FinNet tss-lib before 2.0.0 allows remote authenticated users to spoof MPC messages with replayed Schnorr proofs. The challenge generator in sch.go hashes neither ssid nor any session context or random nonce, so a previously valid proof remains valid in another session. Exploitation requires participation in or observation of protocol traffic and permits message spoofing and identity assumption without reported availability impact.

CVSS severity6.8
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in IO FinNet tss-lib before 2.0.0 allows remote authenticated users to spoof MPC messages with replayed Schnorr proofs. The challenge generator in sch.go hashes neither ssid nor any session context or random nonce, so a previously valid proof remains valid in another session. Exploitation requires participation in or observation of protocol traffic and permits message spoofing and identity assumption without reported availability impact.

The record

CVE
CVE-2022-47930
Published
Apr 21, 2023
Updated
Feb 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-294, CAPEC-60, T1557
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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

6.8GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
6.8NISTCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
6.8CISA-ADPCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
CAPEC-60Reusing Session IDs (aka Session Replay)
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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