CVE-2022-39242: Frontier is an Ethereum compatibility layer for Substrate

Q: How do I fix CVE-2022-39242?

frontier: upgrade to 2022-09-12. Exact commands for each OS are on this page.

Q: Is CVE-2022-39242 being exploited?

CVE-2022-39242 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-39242 affect?

CVE-2022-39242 affects frontier. Severity is medium (CVSS 5.3). Frontier is an Ethereum compatibility layer for Substrate. Prior to commit d3beddc6911a559a3ecc9b3f08e153dbe37a8658, the worst case weight was always accounted as the block weight for all cases. In case of large EVM gas refunds, this can le

Q: How urgent is CVE-2022-39242?

Priority 37/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2022-39242 is a medium-severity flaw (CVSS 5.3) affecting frontier. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Frontier is an Ethereum compatibility layer for Substrate. Prior to commit d3beddc6911a559a3ecc9b3f08e153dbe37a8658, the worst case weight was always accounted as the block weight for all cases. In case of large EVM gas refunds, this can lead to block spamming attacks -- the adversary can construct blocks with transactions that have large amount of refunds or unused gases with reverts, and as a result inflate up the chain gas prices. The impact o

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-682
Published	2022-09-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: parity

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-09-24 02:15 UTCPublished CVE record published
2026-06-17 04:57 UTCUpdated Record last modified

parity frontier UPGRADE

Affected: < 2022-09-12

Fixed in: 2022-09-12

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy frontier || rpm -q frontier || frontier --version

2. UPGRADE to 2022-09-12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade frontier

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade frontier

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-39242?

frontier: upgrade to 2022-09-12. Exact commands for each OS are on this page.

Is CVE-2022-39242 being exploited?

CVE-2022-39242 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-39242 affect?

CVE-2022-39242 affects frontier. Severity is medium (CVSS 5.3). Frontier is an Ethereum compatibility layer for Substrate. Prior to commit d3beddc6911a559a3ecc9b3f08e153dbe37a8658, the worst case weight was always accounted as the block weight for all cases. In case of large EVM gas refunds, this can le

How urgent is CVE-2022-39242?

Priority 37/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-45130 HIGH 7.5 UPGRADE Frontier is Substrate's Ethereum compatibility layer
CVE-2023-28431 HIGH 7.5 UPGRADE Frontier is an Ethereum compatibility layer for Substrate
CVE-2022-36008 HIGH 7.1 MITIGATE Frontier is Substrate's Ethereum compatibility layer
CVE-2022-31111 MEDIUM 5.3 MITIGATE Frontier is Substrate's Ethereum compatibility layer
CVE-2022-21685 MEDIUM 6.5 UPGRADE Frontier is Substrate's Ethereum compatibility layer

References

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