CVE-2020-8806Network attack vector

Double spending via subjective block timestamp validation

Published Feb 5, 2021 · Updated Aug 4, 2024

Consensus validation in Electric Coin Company Zcashd before 2.1.1-1 allows remote attackers to reject a valid chain and enable double spending. Block-header timestamp enforcement uses subjective network-time information, causing an isolated node to permanently reject an otherwise valid chain. Exploitation requires partial network isolation and can deceive a miner or pool into following an attacker-controlled chain view, enabling double spending.

CVSS severity7.5
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Consensus validation in Electric Coin Company Zcashd before 2.1.1-1 allows remote attackers to reject a valid chain and enable double spending. Block-header timestamp enforcement uses subjective network-time information, causing an isolated node to permanently reject an otherwise valid chain. Exploitation requires partial network isolation and can deceive a miner or pool into following an attacker-controlled chain view, enabling double spending.

The record

CVE
CVE-2020-8806
Published
Feb 5, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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