CVE-2020-20237Network attack vector

Authenticated sniffer crash via out-of-bounds write

Published May 18, 2021 · Updated Aug 4, 2024

Memory corruption in MikroTik RouterOS 6.46.3 allows remote authenticated users to crash the sniffer process with a crafted packet. The /nova/bin/sniffer process writes outside its intended memory bounds while handling the packet, ending in SIGSEGV or SIGABRT. Authenticated access and packet delivery to the sniffer are required; the demonstrated consequence is interruption of packet-sniffer service rather than device takeover.

CVSS severity6.5
Medium
EPSS probability2.81%
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 6.46.3 allows remote authenticated users to crash the sniffer process with a crafted packet. The /nova/bin/sniffer process writes outside its intended memory bounds while handling the packet, ending in SIGSEGV or SIGABRT. Authenticated access and packet delivery to the sniffer are required; the demonstrated consequence is interruption of packet-sniffer service rather than device takeover.

The record

CVE
CVE-2020-20237
Published
May 18, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 18, 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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