CVE-2020-11907

Device crash via inconsistent TCP packet lengths

Published Jun 17, 2020 · Updated Aug 4, 2024

Integer underflow in Treck TCP/IP before 6.0.1.66 allows remote attackers to crash devices by sending malformed TCP packets. The TCP component accepts inconsistent packet-length values, causing an integer underflow during packet processing. Unauthenticated remote attackers must deliver the malformed traffic from an adjacent network; the resulting failure crashes or segmentation-faults the device.

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 Treck TCP/IP before 6.0.1.66 allows remote attackers to crash devices by sending malformed TCP packets. The TCP component accepts inconsistent packet-length values, causing an integer underflow during packet processing. Unauthenticated remote attackers must deliver the malformed traffic from an adjacent network; the resulting failure crashes or segmentation-faults the device.

The record

CVE
CVE-2020-11907
Published
Jun 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-130, T1499
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
5.0Rockwell AutomationCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
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.

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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-130Improper Handling of Length Parameter Inconsistency
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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