CVE-2020-20252Public exploitNetwork attack vector

Authenticated process crash via NULL pointer dereference

Published Jul 13, 2021 · Updated Aug 4, 2024

Memory corruption in MikroTik RouterOS before 6.47 allows remote authenticated users to crash the lcdstat process with a crafted packet. The /nova/bin/lcdstat process dereferences a NULL pointer at offset 0x8 while processing the packet, raising SIGSEGV and terminating the process. Valid RouterOS credentials and network reachability are required; the demonstrated consequence is an lcdstat process crash, not code execution or data access.

CVSS severity6.5
Medium
EPSS probability1.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in MikroTik RouterOS before 6.47 allows remote authenticated users to crash the lcdstat process with a crafted packet. The /nova/bin/lcdstat process dereferences a NULL pointer at offset 0x8 while processing the packet, raising SIGSEGV and terminating the process. Valid RouterOS credentials and network reachability are required; the demonstrated consequence is an lcdstat process crash, not code execution or data access.

The record

CVE
CVE-2020-20252
Published
Jul 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, CWE-476, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 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 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.

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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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