CVE-2020-22647Public exploitNetwork attack vector

Contract fund theft via delayed bonus-state update

Published Mar 16, 2023 · Updated Feb 26, 2025

Reentrancy in DepositGame 1.0 allows remote attackers to drain contract funds through GetBonusWithdraw and withdraw calls. A malicious contract reenters GetBonusWithdraw from its fallback before FirstTimeBonus is set, repeatedly restoring the shared _balances value before withdraw transfers Ether. No authentication is required, but exploitation requires interaction with the deployed Ethereum contract and exposes its Ether balance to theft.

CVSS severity9.1
Critical
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reentrancy in DepositGame 1.0 allows remote attackers to drain contract funds through GetBonusWithdraw and withdraw calls. A malicious contract reenters GetBonusWithdraw from its fallback before FirstTimeBonus is set, repeatedly restoring the shared _balances value before withdraw transfers Ether. No authentication is required, but exploitation requires interaction with the deployed Ethereum contract and exposes its Ether balance to theft.

The record

CVE
CVE-2020-22647
Published
Mar 16, 2023
Updated
Feb 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-668, T1657
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
T1657Financial Theft

Public exploit references

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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