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CVE-2018-20421

UnknownEPSS 1.46%

Last modified

CVE-2018-20421 is a vulnerability of currently unknown severity. Go Ethereum (aka geth) 1.8.19 allows attackers to cause a denial of service (memory consumption) by rewriting the length of a dynamic array in memory, and then writing data to a single memory location with a large index number, as demonstrated by use of "assembly { mstore }" followed by a "c[0xC800000] = 0xFF" assignment.. EPSS estimates a 1.46% chance of exploitation in the next 30 days.

Description

Go Ethereum (aka geth) 1.8.19 allows attackers to cause a denial of service (memory consumption) by rewriting the length of a dynamic array in memory, and then writing data to a single memory location with a large index number, as demonstrated by use of "assembly { mstore }" followed by a "c[0xC800000] = 0xFF" assignment.

Metrics

EPSS Probability
1.46%

70.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
EthereumGo Ethereum1.8.19

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2018-20421?
Go Ethereum (aka geth) 1.8.19 allows attackers to cause a denial of service (memory consumption) by rewriting the length of a dynamic array in memory, and then writing data to a single memory location with a large index number, as demonstrated by use of "assembly { mstore }" followed by a "c[0xC800000] = 0xFF" assignment.
How severe is CVE-2018-20421?
Severity scoring for CVE-2018-20421 is pending analysis. The EPSS model estimates a 1.46% probability of exploitation in the next 30 days.
How do I fix CVE-2018-20421?
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.

Are you affected by CVE-2018-20421?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST