What is CVE-2022-31111?

CVE-2022-31111 is a medium-severity vulnerability in Parity Frontier, classified under Always-Incorrect Control Flow Implementation. CVSS score: 5.3/10. Published 2022-07-06.

How severe is CVE-2022-31111?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2022-31111 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Parity Frontier

CVE-2022-31111

Frontier is Substrate's Ethereum compatibility layer. In affected versions the truncation done when converting between EVM balance type and Substrate balance type was incorrectly implemented. This leads to possible discrepancy between appeared EVM transfer value and actual Substrate value transferred. It is recommended that an emergency upgrade to be planned and EVM execution temporarily paused in the mean time. The issue is patched in Frontier master branch commit fed5e0a9577c10bea021721e8c2c5c378e16bf66 and polkadot-v0.9.22 branch commit e3e427fa2e5d1200a784679f8015d4774cedc934. This vulnerability affects only EVM internal states, but not Substrate balance states or node. You can temporarily pause EVM execution (by setting up a Substrate `CallFilter` that disables `pallet-evm` and `pallet-ethereum` calls before the patch can be applied.

Published 2022-07-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.014 (71.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.014 · change: +0.000

Affected products

Parity Frontier
Paritytech Frontier — versions commits prior to fed5e0a9577c10bea021721e8c2c5c378e16bf66

Weakness classification (CWE)

CWE-670 — Always-Incorrect Control Flow Implementation

Public proof-of-concept exploits

References

github.com/paritytech/frontier/security/advisories/GHSA-hc8w-mx86-9fcj (Patch, Third Party Advisory)
github.com/paritytech/frontier/pull/753 (Patch, Third Party Advisory, Issue Tracking)
github.com/paritytech/frontier/commit/e3e427fa2e5d1200a784679f8015d4774cedc934 (Patch, Third Party Advisory)
github.com/paritytech/frontier/commit/fed5e0a9577c10bea021721e8c2c5c378e16bf66 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-31111?: CVE-2022-31111 is a medium-severity vulnerability in Parity Frontier, classified under Always-Incorrect Control Flow Implementation. CVSS score: 5.3/10. Published 2022-07-06.
How severe is CVE-2022-31111?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2022-31111 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.