CVE-2020-11102Network attack vector

Guest-to-host code execution via unchecked Tulip frame copies

Published Apr 6, 2020 · Updated Aug 4, 2024

Out-of-bounds access in QEMU 4.2.0 allows guest OS users to crash or execute code in the host QEMU process via Tulip NIC traffic. The tulip_copy_tx_buffers path copies transmit and receive frames without checking the frame size against the descriptor data length, causing out-of-bounds buffer access. A guest must control the emulated Tulip adapter's descriptors or traffic; exploitation can stop the virtual machine or run code with the QEMU process's host privileges.

CVSS severity5.6
Medium
EPSS probability1.97%
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 access in QEMU 4.2.0 allows guest OS users to crash or execute code in the host QEMU process via Tulip NIC traffic. The tulip_copy_tx_buffers path copies transmit and receive frames without checking the frame size against the descriptor data length, causing out-of-bounds buffer access. A guest must control the emulated Tulip adapter's descriptors or traffic; exploitation can stop the virtual machine or run code with the QEMU process's host privileges.

The record

CVE
CVE-2020-11102
Published
Apr 6, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 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

5.6NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
6.8NIST NVDAV:N/AC:M/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-787Out-of-bounds Write
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.

Technologies

Your stack

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Your stack

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