CVE-2018-20421 — HIGH (7.5)

Vulnerability 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.

CVSS Score

7.5

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Ethereum	Go Ethereum	1.8.19

Related Weaknesses (CWE)

CWE-770

References

https://github.com/ethereum/go-ethereum/issues/18289ExploitThird Party Advisory
https://github.com/ethereum/go-ethereum/issues/18289ExploitThird Party Advisory

FAQ

What is CVE-2018-20421?

CVE-2018-20421 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...

How severe is CVE-2018-20421?

CVE-2018-20421 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2018-20421?

Check the references section above for vendor advisories and patch information. Affected products include: Ethereum Go Ethereum.