How severe is CVE-2018-13877?

CVE-2018-13877 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-13877 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-13877?

CVE-2018-13877 affects Megacryptopolis. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-13877?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-13877 published?

CVE-2018-13877 was published on 2018-08-06 and last updated on 2026-06-17.

CVE-2018-13877

CVE-2018-13877 is a high-severity vulnerability in Megacryptopolis with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Megacryptopolis
Published: 2018-08-06
Last modified: 2026-06-17

Description

The doPayouts() function of the smart contract implementation for MegaCryptoPolis, an Ethereum game, has a Denial of Service vulnerability. If a smart contract that has a fallback function always causing exceptions buys a land, users cannot buy lands near that contract's land, because those purchase attempts will not be completed unless the doPayouts() function successfully sends Ether to certain neighbors.

Frequently asked questions

What is CVE-2018-13877?: The doPayouts() function of the smart contract implementation for MegaCryptoPolis, an Ethereum game, has a Denial of Service vulnerability. If a smart contract that has a fallback function always causing exceptions buys a land, users cannot buy lands near that contract's land, because those purchase attempts will not be completed unless the doPayouts() function successfully sends Ether to certain neighbors.
How severe is CVE-2018-13877?: CVE-2018-13877 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-13877 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-13877?: CVE-2018-13877 affects Megacryptopolis. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-13877?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-13877 published?: CVE-2018-13877 was published on 2018-08-06 and last updated on 2026-06-17.

References

https://medium.com/coinmonks/denial-of-service-dos-attack-on-megacryptopolis-an-ethereum-game-cve-2018-13877-cdd7f7ef8b08

Affected products (1)

cpe:2.3:a:megacryptopolis:megacryptopolis:-:*:*:*:*:*:*:*

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