Description
Frontier is Substrate's Ethereum compatibility layer. Prior to commit number `8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664`, a bug in Frontier's MODEXP precompile implementation can cause an integer underflow in certain conditions. This will cause a node crash for debug builds. For release builds (and production WebAssembly binaries), the impact is limited as it can only cause a normal EVM out-of-gas. Users who do not use MODEXP precompile in their runtime are not impacted. A patch is available in pull request #549.
References (3)
Core 3
Core References
Patch, Third Party Advisory x_refsource_confirm
https://github.com/paritytech/frontier/security/advisories/GHSA-cjg2-2fjg-fph4
Patch, Third Party Advisory x_refsource_misc
https://github.com/paritytech/frontier/pull/549
Patch, Third Party Advisory x_refsource_misc
https://github.com/paritytech/frontier/commit/8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664
Scores
CVSS v3
6.5
EPSS
0.0044
EPSS Percentile
63.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-191
Status
published
Products (2)
crates.io/pallet-evm-precompile-modexp
0crates.io
parity/frontier
< 2022-01-13
Published
Jan 14, 2022
Tracked Since
Feb 18, 2026