CVE-2020-26142Public exploit

Packet injection via fragmented-frame misprocessing

Published May 11, 2021 · Updated Aug 4, 2024

Improper frame processing in the OpenBSD 6.6 kernel allows physically proximate attackers to inject arbitrary network packets over Wi-Fi. The Wi-Fi receive path accepts a last fragment without a first fragment as a complete frame, delivering its encapsulated packet instead of rejecting it. A victim must interact with the attack mechanism, and the attacker must be within Wi-Fi radio range; the consequence is forged-packet delivery rather than reported disclosure or interruption.

CVSS severity5.3
Medium
EPSS probability2.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper frame processing in the OpenBSD 6.6 kernel allows physically proximate attackers to inject arbitrary network packets over Wi-Fi. The Wi-Fi receive path accepts a last fragment without a first fragment as a complete frame, delivering its encapsulated packet instead of rejecting it. A victim must interact with the attack mechanism, and the attacker must be within Wi-Fi radio range; the consequence is forged-packet delivery rather than reported disclosure or interruption.

The record

CVE
CVE-2020-26142
Published
May 11, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-74, T1659
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 11, 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?

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

2.6NIST NVDAV:N/AC:H/Au:N/C:N/I:P/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1659Content Injection

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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