Buffer overflow in go-ethereum - CVE-2021-39137
Published: August 24, 2021 / Updated: April 27, 2026
Vulnerability identifier: #VU127993
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-39137
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a consensus error.
The vulnerability exists due to memory corruption in the Geth EVM when processing a maliciously crafted transaction. A remote attacker can send a maliciously crafted transaction to cause a consensus error.
Successful exploitation can cause vulnerable nodes to compute a different stateRoot and reject the canonical chain, potentially splitting the chain into two forks.
Affected software
go-ethereum
How to mitigate CVE-2021-39137
Install security update from vendor's website.
go-ethereum - update to 1.10.8