CVE-2020-7464Network attack vector

Packet injection via truncated USB transfer lengths

Published Mar 26, 2021 · Updated Aug 4, 2024

Packet injection in affected FreeBSD 11.3-RELEASE through 12.2-STABLE builds allows remote attackers to bypass VLAN boundaries. The ure(4) driver programs some Realtek USB Ethernet interfaces so transfers longer than 2048 bytes are reported as only 2048 bytes, then parses the remaining payload as another packet. Exposure requires an affected Realtek USB interface and a large frame; injected packets can spoof other hosts, without reported disclosure or service interruption.

CVSS severity5.3
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Packet injection in affected FreeBSD 11.3-RELEASE through 12.2-STABLE builds allows remote attackers to bypass VLAN boundaries. The ure(4) driver programs some Realtek USB Ethernet interfaces so transfers longer than 2048 bytes are reported as only 2048 bytes, then parses the remaining payload as another packet. Exposure requires an affected Realtek USB interface and a large frame; injected packets can spoof other hosts, without reported disclosure or service interruption.

The record

CVE
CVE-2020-7464
Published
Mar 26, 2021
Updated
Aug 4, 2024
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-74, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2021CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=FreeBSD 12.1-RELEASE before p10, 11.4-RELEASE before p4, 11.3-RELEASE before p14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=FreeBSD 12.1-RELEASE before p10, 11.4-RELEASE before p4, 11.3-RELEASE before p14

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1565.002Transmitted Data Manipulation

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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