CVE-2020-27302Public exploit

PSK-authenticated code execution via unchecked GTK copy

Published Jun 4, 2021 · Updated Aug 4, 2024

Stack buffer overflow in Realtek Ameba SDK before 7.1d allows remote authenticated users to execute code via a crafted WPA2 handshake. In DecGTK(), an attacker-controlled encrypted GTK length reaches _wrap_memcpy() without validation against the 0x80-byte kout stack buffer. Exploitation requires the network PSK and Wi-Fi proximity; success gives control of the Wi-Fi module, while host root access depends on device integration.

CVSS severity8.0
High
EPSS probability2.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Realtek Ameba SDK before 7.1d allows remote authenticated users to execute code via a crafted WPA2 handshake. In DecGTK(), an attacker-controlled encrypted GTK length reaches _wrap_memcpy() without validation against the 0x80-byte kout stack buffer. Exploitation requires the network PSK and Wi-Fi proximity; success gives control of the Wi-Fi module, while host root access depends on device integration.

The record

CVE
CVE-2020-27302
Published
Jun 4, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.0NIST NVDCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7NIST NVDAV:A/AC:L/Au:S/C:C/I:C/A:C

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)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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