CVE-2020-20265Network attack vector

Authenticated denial of service via wireless memory corruption

Published May 11, 2021 · Updated Aug 4, 2024

Memory corruption in MikroTik RouterOS before 6.47 allows remote authenticated users to cause denial of service via crafted packets. The wireless process at /ram/pckg/wireless/nova/bin/wireless performs invalid memory access when handling a crafted packet, crashing the process. Exploitation requires an authenticated remote account and results in service interruption rather than disclosed confidentiality or integrity impact.

CVSS severity6.5
Medium
EPSS probability2.11%
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 cause denial of service via crafted packets. The wireless process at /ram/pckg/wireless/nova/bin/wireless performs invalid memory access when handling a crafted packet, crashing the process. Exploitation requires an authenticated remote account and results in service interruption rather than disclosed confidentiality or integrity impact.

The record

CVE
CVE-2020-20265
Published
May 11, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 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

4.0INCIBEAV:N/AC:L/Au:S/C:N/I:N/A:P
6.5TenableCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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