CVE-2020-20218Network attack vector

Authenticated traceroute crash via loop counter corruption

Published May 3, 2021 · Updated Aug 4, 2024

Memory corruption in MikroTik RouterOS 6.44.6 allows remote authenticated users to crash the traceroute process via a crafted packet. The /nova/bin/traceroute process mishandles its loop counter while processing the packet, causing an invalid memory access. Valid RouterOS credentials and network access are required, and the documented consequence is termination of traceroute rather than a full-device outage.

CVSS severity6.5
Medium
EPSS probability1.96%
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 6.44.6 allows remote authenticated users to crash the traceroute process via a crafted packet. The /nova/bin/traceroute process mishandles its loop counter while processing the packet, causing an invalid memory access. Valid RouterOS credentials and network access are required, and the documented consequence is termination of traceroute rather than a full-device outage.

The record

CVE
CVE-2020-20218
Published
May 3, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 3, 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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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