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CVE-2022-21685 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/paritytech/frontier/commit/8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664	CVE	PatchThird Party Advisory
https://github.com/paritytech/frontier/pull/549	CVE	PatchThird Party Advisory
https://github.com/paritytech/frontier/security/advisories/GHSA-cjg2-2fjg-fph4	CVE	PatchThird Party Advisory
https://github.com/paritytech/frontier/commit/8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664	[email protected]	PatchThird Party Advisory
https://github.com/paritytech/frontier/pull/549	[email protected]	PatchThird Party Advisory
https://github.com/paritytech/frontier/security/advisories/GHSA-cjg2-2fjg-fph4	[email protected]	PatchThird Party Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-191	Integer Underflow (Wrap or Wraparound)	[email protected]
CWE-191	Integer Underflow (Wrap or Wraparound)	[email protected]

Affected Products

Product	Versions
parity frontier	<= 2022-01-13
CPE cpe:2.3:a:parity:frontier:::::::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jan 21, 2022	Initial Analysis	[email protected]