CVE-2022-21685 json
Integer underflow in Frontier
published 2022-01-14 4 y ago modified 2026-06-17 4 mo ago also GHSA-cjg2-2fjg-fph4 , EUVD-2022-0562
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 72%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 18 mo ago
Exploit prediction
1.38% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:N/A:P |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | pallet-evm-precompile-modexp | <=1.0.0 |
no fix listed |
Affected products
- paritytech frontier
Classification
- Weakness
-
- CWE-191 Integer Underflow (Wrap or Wraparound)
References
-
github.com
/paritytech/frontier/pull/549
web, patch, third-party-advisory
-
github.com
/paritytech/frontier/commit/8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664
web, patch, third-party-advisory
-
github.com
/paritytech/frontier/security/advisories/GHSA-cjg2-2fjg-fph4
web, patch, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2022-21685
advisory
-
github.com
/paritytech/frontier
package
Sources
- CVE List CVE-2022-21685
- GitHub Advisory GHSA-cjg2-2fjg-fph4
- NVD CVE-2022-21685
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.