CVE-2021-36614Network attack vector

Authenticated process crash via NULL-pointer dereference

Published May 11, 2022 · Updated Aug 4, 2024

NULL-pointer dereference in MikroTik RouterOS before 6.48.2 allows remote authenticated users to crash the tr069-client process. The process dereferences a NULL pointer while handling a crafted management packet, terminating with signal 11 instead of rejecting the input. Access to an authenticated TR-069 management path is required, and the demonstrated consequence is interruption of that client process rather than device-wide shutdown or code execution.

CVSS severity6.5
Medium
EPSS probability2.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in MikroTik RouterOS before 6.48.2 allows remote authenticated users to crash the tr069-client process. The process dereferences a NULL pointer while handling a crafted management packet, terminating with signal 11 instead of rejecting the input. Access to an authenticated TR-069 management path is required, and the demonstrated consequence is interruption of that client process rather than device-wide shutdown or code execution.

The record

CVE
CVE-2021-36614
Published
May 11, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2022CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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