CVE-2020-11897Network attack vector

Unauthenticated memory corruption via inconsistent IPv6 lengths

Published Jun 17, 2020 · Updated Aug 4, 2024

Out-of-bounds write in the Treck TCP/IP stack before 5.0.1.35 allows remote attackers to corrupt memory using malformed IPv6 packets. The IPv6 component mishandles inconsistent packet-length parameters across a sequence of malformed packets and writes beyond the intended buffer. Any network path that delivers IPv6 traffic to an embedded device using the affected stack is sufficient; the documented consequence is memory corruption, without a product-specific execution outcome.

CVSS severity10.0
Critical
EPSS probability9.14%
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 write in the Treck TCP/IP stack before 5.0.1.35 allows remote attackers to corrupt memory using malformed IPv6 packets. The IPv6 component mishandles inconsistent packet-length parameters across a sequence of malformed packets and writes beyond the intended buffer. Any network path that delivers IPv6 traffic to an embedded device using the affected stack is sufficient; the documented consequence is memory corruption, without a product-specific execution outcome.

The record

CVE
CVE-2020-11897
Published
Jun 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
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

10.0NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
10.0NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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