CVE-2020-27302: A stack buffer overflow in Realtek RTL8710 (and other Ameba-based devices) can lead to remote code execution v

This month

HIGH 8.0MITIGATEMITIGATE

CVE-2020-27302 is a high-severity flaw (CVSS 8.0) affecting rtl8710c firmware, rtl8195a firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stack buffer overflow in Realtek RTL8710 (and other Ameba-based devices) can lead to remote code execution via the "memcpy" function, when an attacker in Wi-Fi range sends a crafted "Encrypted GTK" value as part of the WPA2 4-way-handshake.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.0 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-06-04
Last modified	2026-06-17

Publisher (CNA): VDOO Connected Trust Ltd. · Vendor: realtek

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-06-04 13:15 UTCPublished CVE record published
2026-06-17 03:09 UTCUpdated Record last modified

realtek rtl8710c firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

realtek rtl8195a firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-27302?

rtl8710c firmware: mitigate or apply the listed mitigation; rtl8195a firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-27302 being exploited?

CVE-2020-27302 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-27302 affect?

CVE-2020-27302 affects rtl8710c firmware, rtl8195a firmware. Severity is high (CVSS 8.0). A stack buffer overflow in Realtek RTL8710 (and other Ameba-based devices) can lead to remote code execution via the "memcpy" function, when an attacker in Wi-Fi range sends a crafted "Encrypted GTK" value as part of the WPA2 4-way-handshak

How urgent is CVE-2020-27302?

Priority 53/100. High severity; Public exploit reference

Software pages

Wi-Fi vulnerabilities

Related CVEs

CVE-2020-27301 HIGH 8.0 MITIGATE MITIGATE A stack buffer overflow in Realtek RTL8710 (and other Ameba-based devices) can lead to remote code execution v

References

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