CVE-2021-31828Network attack vector

Authenticated SSRF via unrestricted alert destinations

Published May 6, 2021 · Updated Aug 3, 2024

SSRF in the Alerting plugin in Amazon Open Distro for Elasticsearch before 1.13.1.0 allows remote authenticated users to reach arbitrary hosts. Destination creation accepts user-supplied HTTP endpoints without rejecting hosts outside the intended notification scope. Alerting-management privileges are required; successful requests can enumerate listening services or interact with reachable resources.

CVSS severity7.1
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in the Alerting plugin in Amazon Open Distro for Elasticsearch before 1.13.1.0 allows remote authenticated users to reach arbitrary hosts. Destination creation accepts user-supplied HTTP endpoints without rejecting hosts outside the intended notification scope. Alerting-management privileges are required; successful requests can enumerate listening services or interact with reachable resources.

The record

CVE
CVE-2021-31828
Published
May 6, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1090.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
5.5NIST NVDAV:N/AC:L/Au:S/C:P/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 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

CWE-918Server-Side Request Forgery (SSRF)
T1090.001Proxy: Internal Proxy

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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