What is CVE-2020-23539?

CVE-2020-23539 is a high-severity vulnerability in Realtek Rtl8723de, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-04-08.

How severe is CVE-2020-23539?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2020-23539 known to be exploited?

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

NULL pointer dereference in Realtek Rtl8723de

CVE-2020-23539

An issue was discovered in Realtek rtl8723de BLE Stack <= 4.1 that allows remote attackers to cause a Denial of Service via the interval field to the CONNECT_REQ message.

Published 2021-04-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

References

github.com/pokerfacett/MY_REQUEST/blob/df73fe140655ea44542b03ac186e6c2b47e97540… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-23539?: CVE-2020-23539 is a high-severity vulnerability in Realtek Rtl8723de, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-04-08.
How severe is CVE-2020-23539?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-23539 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.