CVE-2020-11906

Unspecified impact via Ethernet integer underflow

Published Jun 17, 2020 · Updated Aug 4, 2024

Integer underflow in the Ethernet Link Layer of Treck TCP/IP stack before 6.0.1.66 allows attackers to cause unspecified impact. Public sources identify improper input validation in the Ethernet Link Layer but do not disclose the affected frame field, arithmetic operation, or resulting memory behavior. Exploitation requires crafted Ethernet traffic from the same link-layer network without authentication or user interaction; the vulnerability-specific consequence remains undisclosed.

CVSS severity6.3
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

Integer underflow in the Ethernet Link Layer of Treck TCP/IP stack before 6.0.1.66 allows attackers to cause unspecified impact. Public sources identify improper input validation in the Ethernet Link Layer but do not disclose the affected frame field, arithmetic operation, or resulting memory behavior. Exploitation requires crafted Ethernet traffic from the same link-layer network without authentication or user interaction; the vulnerability-specific consequence remains undisclosed.

The record

CVE
CVE-2020-11906
Published
Jun 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-191
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.8NIST NVDAV:A/AC:L/Au:N/C:P/I:P/A:P
6.3NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)

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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