CVE-2020-12797Network attack vector

Unauthorized access via stale replicated ACL rules

Published Jun 11, 2020 · Updated Aug 4, 2024

Improper access control in HashiCorp Consul 1.4.0 through 1.6.5 and 1.7.0 through 1.7.3 allows remote authenticated users to retain permissions. Legacy ACL conversion omits the token hash used to detect changes, so updated rules are not replicated from the primary to secondary data centers. Exploitation requires a multi-data-center deployment with token replication and an existing legacy ACL token; secondary data centers continue applying its stale permissions.

CVSS severity5.3
Medium
EPSS probability1.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in HashiCorp Consul 1.4.0 through 1.6.5 and 1.7.0 through 1.7.3 allows remote authenticated users to retain permissions. Legacy ACL conversion omits the token hash used to detect changes, so updated rules are not replicated from the primary to secondary data centers. Exploitation requires a multi-data-center deployment with token replication and an existing legacy ACL token; secondary data centers continue applying its stale permissions.

The record

CVE
CVE-2020-12797
Published
Jun 11, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 11, 2020CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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