CVE-2021-3024Network attack vector

Internal IP disclosure via invalid API requests

Published Feb 1, 2021 · Updated Aug 3, 2024

Information disclosure in HashiCorp Vault 1.4.0 through 1.5.6 and 1.6.0 through 1.6.1 allows remote attackers to read a node's internal IP address. The API request handler includes the configured API_ADDR field in responses to certain invalid HTTP requests instead of suppressing it. No authentication is required; exposure is limited to the node's internal IP address, with no reported access to stored secrets or configuration changes.

CVSS severity5.3
Medium
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in HashiCorp Vault 1.4.0 through 1.5.6 and 1.6.0 through 1.6.1 allows remote attackers to read a node's internal IP address. The API request handler includes the configured API_ADDR field in responses to certain invalid HTTP requests instead of suppressing it. No authentication is required; exposure is limited to the node's internal IP address, with no reported access to stored secrets or configuration changes.

The record

CVE
CVE-2021-3024
Published
Feb 1, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1590.005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/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

T1590.005Gather Victim Network Information: IP Addresses

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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