CVE-2020-11899Known exploitation

Unauthenticated out-of-bounds read via IPv6 processing

Published Jun 17, 2020 · Updated Oct 21, 2025

Out-of-bounds read in Treck TCP/IP before 6.0.1.66 allows remote attackers to trigger invalid memory access through IPv6 traffic. Public disclosures identify IPv6 packet processing as the locus but do not name the affected function, packet field, or unchecked length operation. No authentication or user interaction is required from an adjacent network, and the published assessment limits impact to device-state changes or service interruption rather than data disclosure.

CVSS severity5.4
Medium
EPSS probability18.56%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Treck TCP/IP before 6.0.1.66 allows remote attackers to trigger invalid memory access through IPv6 traffic. Public disclosures identify IPv6 packet processing as the locus but do not name the affected function, packet field, or unchecked length operation. No authentication or user interaction is required from an adjacent network, and the published assessment limits impact to device-state changes or service interruption rather than data disclosure.

The record

CVE
CVE-2020-11899
Published
Jun 17, 2020
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 2020CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record 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

4.8NIST NVDAV:A/AC:L/Au:N/C:N/I:P/A:P
5.4NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/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.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
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.

Reported exploitation

Technologies

Your stack

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Your stack

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