CVE-2021-41057

Local service interruption via crafted CmDongles symlink

Published Nov 14, 2021 · Updated Aug 4, 2024

Improper link resolution in WIBU CodeMeter Runtime before 7.30a allows local users to overwrite essential Windows files. The Windows service follows an attacker-created link to a special system file used with CmDongles and writes through it without validating target permissions. An unprivileged account on a machine where CodeMeter runs as a Windows service is required, and overwriting essential files can interrupt availability.

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

What happened

Improper link resolution in WIBU CodeMeter Runtime before 7.30a allows local users to overwrite essential Windows files. The Windows service follows an attacker-created link to a special system file used with CmDongles and writes through it without validating target permissions. An unprivileged account on a machine where CodeMeter runs as a Windows service is required, and overwriting essential files can interrupt availability.

The record

CVE
CVE-2021-41057
Published
Nov 14, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-59, CWE-269, T1485
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 14, 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1WIBU-SYSTEMS AGCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
3.6NIST NVDAV:L/AC:L/Au:N/C:N/I:P/A:P
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
CWE-269Improper Privilege Management
T1485Data Destruction

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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