The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an…
Priority MEDIUM 41Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to cause a denial of service (long-range consensus chain reorganizations), even when this adversary has little stake and cannot influence network message propagation. This can cause a protocol stall, or an increase in the profits of individual validators.
Why it matters now
EPSS 0.00961 61st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:proof-of-stake_ethereum_project:proof-of-stake_ethereum:*:*:*:*:*:*:*:* | up to 2021-10-19 | Vulnerable | Proof-of-stake Ethereum Project |
- cpe:2.3:a:proof-of-stake_ethereum_project:proof-of-stake_ethereum:*:*:*:*:*:*:*:* Versions up to 2021-10-19 Vulnerable ·Proof-of-stake Ethereum Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-42766
- 2026-10-03 Alias added: GHSA-xh87-56v2-2mrp
References
Advisory 1
More Proof-of-stake Ethereum Project Proof-of-stake Ethereum vulnerabilities
- TI-2021-18968 The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an… CVSS 3.1CRITICAL 9.1
- TI-2021-18969 The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an… CVSS 3.1HIGH 7.5
Sources
- CVE-2021-42766 · CVE Program
- CVE-2021-42766 · NVD
- FIRST EPSS
- GHSA-xh87-56v2-2mrp · GitHub Advisory Database · CC BY 4.0
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