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CVE-2020-26240

MEDIUM
Published 2020-11-25T01:25:27
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Expert Analysis

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CVSS Score

V3.1
5.3
/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.003
probability
of exploitation in the wild

There is a 0.3% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.500
Higher than 50.0% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
HIGH
Availability
NONE

Description

Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. An ethash mining DAG generation flaw in Geth before version 1.9.24 could cause miners to erroneously calculate PoW in an upcoming epoch (estimated early January, 2021). This happened on the ETC chain on 2020-11-06. This issue is relevant only for miners, non-mining nodes are unaffected. This issue is fixed as of 1.9.24

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

ethereum

go-ethereum

Affected Versions:

< 1.9.24

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

Erroneous Proof of Work calculation in geth

GHSA-v592-xf75-856p

Advisory Details

### Impact An ethash mining DAG generation flaw in Geth could cause miners to erroneously calculate PoW in an upcoming epoch (estimated early January, 2021). This happened on the ETC chain on 2020-11-06. This issue is relevant only for miners, non-mining nodes are unaffected. ### Patches This issue is also fixed as of 1.9.24. Thanks to @slavikus for bringing the issue to our attention and writing the fix. ### Workarounds This PR implements a patch: https://github.com/ethereum/go-ethereum/pull/21793 ### References https://blog.ethereum.org/2020/11/12/geth_security_release/ ### For more information If you have any questions or comments about this advisory: * Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum) * Email us at [[email protected]](mailto:[email protected])

Affected Packages

Go github.com/ethereum/go-ethereum
ECOSYSTEM: ≥0 <1.9.24

CVSS Scoring

CVSS Score

5.0

CVSS Vector

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

References

WEB https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856p
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2020-26240
WEB https://github.com/ethereum/go-ethereum/pull/21793
WEB https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0
WEB https://blog.ethereum.org/2020/11/12/geth_security_release
PACKAGE https://github.com/ethereum/go-ethereum

Advisory provided by GitHub Security Advisory Database. Published: June 29, 2021, Modified: January 30, 2025

References

https://blog.ethereum.org/2020/11/12/geth_security_release/
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856p
https://github.com/ethereum/go-ethereum/pull/21793
https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0
Published: 2020-11-25T01:25:27
Last Modified: 2024-08-04T15:56:04.861Z
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