What is CVE-2020-27301?

CVE-2020-27301 is a high-severity vulnerability in Realtek Rtl8195a, classified under Out-of-bounds Write. CVSS score: 8.0/10. Published 2021-06-04.

How severe is CVE-2020-27301?

High severity. CVSS v3 base score is 8.0 out of 10.

Is CVE-2020-27301 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Realtek Rtl8195a

CVE-2020-27301

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

Vulnerability class: Buffer Overflow

Published 2021-06-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

www.vdoo.com/blog/realtek-wifi-vulnerabilities-zero-day (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27301?: CVE-2020-27301 is a high-severity vulnerability in Realtek Rtl8195a, classified under Out-of-bounds Write. CVSS score: 8.0/10. Published 2021-06-04.
How severe is CVE-2020-27301?: High severity. CVSS v3 base score is 8.0 out of 10.
Is CVE-2020-27301 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.