CVE-2020-11902Network attack vector

Remote memory disclosure via IPv6-over-IPv4 tunneling

Published Jun 17, 2020 · Updated Aug 4, 2024

Out-of-bounds read in Treck TCP/IP before 6.0.1.66 allows remote attackers to read memory via IPv6-over-IPv4 tunnel traffic. The public record identifies the IPv6-over-IPv4 tunneling path, but Treck has not disclosed the parser or unchecked length operation that reads beyond its buffer. The target must process IPv6 encapsulated in IPv4; the bounded consequence is unintended memory disclosure, with no demonstrated code execution or service interruption for this CVE.

CVSS severity7.3
High
EPSS probability9.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
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 read memory via IPv6-over-IPv4 tunnel traffic. The public record identifies the IPv6-over-IPv4 tunneling path, but Treck has not disclosed the parser or unchecked length operation that reads beyond its buffer. The target must process IPv6 encapsulated in IPv4; the bounded consequence is unintended memory disclosure, with no demonstrated code execution or service interruption for this CVE.

The record

CVE
CVE-2020-11902
Published
Jun 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125
Attack vector
network
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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5NIST NVDAV: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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