CVE-2018-17877: A lottery smart contract implementation for Greedy 599, an Ethereum gambling game, generates a random value th

This week

HIGH 7.5REMOTEMITIGATE

CVE-2018-17877 is a high-severity flaw (CVSS 7.5) affecting greedy 599. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A lottery smart contract implementation for Greedy 599, an Ethereum gambling game, generates a random value that is predictable via an external contract call. The developer used the extcodesize() function to prevent a malicious contract from being called, but the attacker can bypass it by writing the core code in the constructor of their exploit code. Therefore, it allows attackers to always win and get rewards.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-338
Published	2018-10-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: greedy599

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

Am I affected?

Timeline

2018-10-23 21:30 UTCPublished CVE record published
2026-06-17 01:46 UTCUpdated Record last modified

greedy599 greedy 599 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 greedy-599 || rpm -q greedy-599 || greedy-599 --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-2018-17877?

greedy 599: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-17877 being exploited?

CVE-2018-17877 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-2018-17877 affect?

CVE-2018-17877 affects greedy 599. Severity is high (CVSS 7.5). A lottery smart contract implementation for Greedy 599, an Ethereum gambling game, generates a random value that is predictable via an external contract call. The developer used the extcodesize() function to prevent a malicious contract fro

How urgent is CVE-2018-17877?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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