CVE-2020-6996Network attack vector

Unauthenticated service interruption via crafted DNP3 message

Published Apr 15, 2020 · Updated Aug 4, 2024

Stack-based buffer overflow in Triangle MicroWorks DNP3 Outstation Libraries 3.16.00 through 3.25.01 allows remote attackers to interrupt service. The public advisory identifies a specially crafted DNP3 message as the trigger but does not disclose the parsing routine or stack-write operation. No authentication or user interaction is required; network access to an outstation endpoint is the exposure gate.

CVSS severity9.8
Critical
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Triangle MicroWorks DNP3 Outstation Libraries 3.16.00 through 3.25.01 allows remote attackers to interrupt service. The public advisory identifies a specially crafted DNP3 message as the trigger but does not disclose the parsing routine or stack-write operation. No authentication or user interaction is required; network access to an outstation endpoint is the exposure gate.

The record

CVE
CVE-2020-6996
Published
Apr 15, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, CWE-121, T0866, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2020CVE 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T0866Exploitation of Remote Services
T0814Denial 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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