CVE-2021-40537Network attack vector

Administrator-only internal resource access via unfiltered LDAP settings

Published Sep 8, 2021 · Updated Aug 4, 2024

SSRF in ownCloud user_ldap before 0.15.4 allows remote authenticated users with an administration role to access internal resources. The user_ldap settings path fails to reject invalid characters before making a server-side request, but ownCloud has not identified the affected setting or code locus. An administration role is required, and the published impact is limited to disclosure from resources reachable by the ownCloud server.

CVSS severity4.1
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in ownCloud user_ldap before 0.15.4 allows remote authenticated users with an administration role to access internal resources. The user_ldap settings path fails to reject invalid characters before making a server-side request, but ownCloud has not identified the affected setting or code locus. An administration role is required, and the published impact is limited to disclosure from resources reachable by the ownCloud server.

The record

CVE
CVE-2021-40537
Published
Sep 8, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 8, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.1ownCloudCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
2.7NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
4.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:S/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

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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