CVE-2021-37711Network attack vector

Authenticated SSRF via IPv4-mapped IPv6 URLs

Published Aug 16, 2021 · Updated Aug 4, 2024

Server-side request forgery in Shopware Platform 6.4.3.0 and earlier allows remote authenticated users to request internal URLs. FileUrlValidator validates an IPv4-mapped address as IPv6 without rechecking its embedded IPv4 value, so private and loopback destinations pass the URL filter. An authenticated account able to upload a file by URL is required; the server can then be directed to private or loopback services.

CVSS severity8.8
High
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Shopware Platform 6.4.3.0 and earlier allows remote authenticated users to request internal URLs. FileUrlValidator validates an IPv4-mapped address as IPv6 without rechecking its embedded IPv4 value, so private and loopback destinations pass the URL filter. An authenticated account able to upload a file by URL is required; the server can then be directed to private or loopback services.

The record

CVE
CVE-2021-37711
Published
Aug 16, 2021
Updated
Aug 4, 2024
Vendor
Shopware
Product
Shopware Platform
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 6.4.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shopware · Shopware Platformversion=<= 6.4.3.0

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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)
T1190Exploit Public-Facing Application

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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