CVE-2022-21685 - CVE House
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Status published Medium CVE-2022-21685

Integer underflow in Frontier

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2023-28431
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CVE-2022-39242
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CVE-2022-36008
Message length overflow in frontier
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Affected Vendor

Affected Software

frontier
Vulnerable Versions:
< 8a93fdc

Timeline

Official Publish: January 14th, 2022
Last Modified: April 23rd, 2025
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-191

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1574 Hijack Execution Flow
Privilege Escalation
T1059 Command and Scripting Interpreter
Execution
T1485 Data Destruction
Impact
T1499 Endpoint Denial of Service
Impact