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CVE-2018-18920

UnknownEPSS 2.90%

Last modified

CVE-2018-18920 is a vulnerability of currently unknown severity. Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.execute_bytecode call that triggers computation._stack.values with '"stack": [100, 100, 0]' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed indefinitely without gas being paid.". EPSS estimates a 2.90% chance of exploitation in the next 30 days.

Description

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.execute_bytecode call that triggers computation._stack.values with '"stack": [100, 100, 0]' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed indefinitely without gas being paid."

Metrics

EPSS Probability
2.90%

85.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
EthereumPy-Evm0.2.0Alpha.33

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2018-18920?
Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.execute_bytecode call that triggers computation._stack.values with '"stack": [100, 100, 0]' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed indefinitely without gas being paid."
How severe is CVE-2018-18920?
Severity scoring for CVE-2018-18920 is pending analysis. The EPSS model estimates a 2.90% probability of exploitation in the next 30 days.
How do I fix CVE-2018-18920?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST