CVE-2021-30141Public exploitNetwork attack vector

Service interruption via unchecked user export

Published Apr 5, 2021 · Updated Aug 3, 2024

Improper access control in Friendica through 2021.01 allows remote attackers to exhaust server memory through the user-export route. The UserExport module invokes export logic without first rejecting a missing local user, so a null user identifier reaches database-backed export paths and consumes memory. Friendica disputes unauthenticated exploitability because a valid authentication cookie is required; the demonstrated consequence is a PHP fatal error and service interruption, not data export.

CVSS severity7.5
High
EPSS probability1.52%
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 Friendica through 2021.01 allows remote attackers to exhaust server memory through the user-export route. The UserExport module invokes export logic without first rejecting a missing local user, so a null user identifier reaches database-backed export paths and consumes memory. Friendica disputes unauthenticated exploitability because a valid authentication cookie is required; the demonstrated consequence is a PHP fatal error and service interruption, not data export.

The record

CVE
CVE-2021-30141
Published
Apr 5, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401, T1499
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 5, 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 privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

Public exploit references

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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