CVE-2020-11898Public exploitNetwork attack vector

Heap-memory disclosure via inconsistent inner-packet length

Published Jun 17, 2020 · Updated Aug 4, 2024

Out-of-bounds read in IPv4/ICMPv4 handling in Treck TCP/IP before 6.0.1.66 allows remote attackers to read heap memory via crafted packets. A fragmented outer IPv4 packet carries an inner packet whose declared length is shorter than its payload; an invalid protocol number then provokes an ICMP error that copies adjacent heap bytes into the reply. Exploitation requires network reachability for IP-in-IP fragments and discloses memory without authentication or user interaction.

CVSS severity9.1
Critical
EPSS probability18.87%
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 IPv4/ICMPv4 handling in Treck TCP/IP before 6.0.1.66 allows remote attackers to read heap memory via crafted packets. A fragmented outer IPv4 packet carries an inner packet whose declared length is shorter than its payload; an invalid protocol number then provokes an ICMP error that copies adjacent heap bytes into the reply. Exploitation requires network reachability for IP-in-IP fragments and discloses memory without authentication or user interaction.

The record

CVE
CVE-2020-11898
Published
Jun 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-130, T1048
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

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-130Improper Handling of Length Parameter Inconsistency
T1048Exfiltration Over Alternative Protocol

Public exploit references

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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