What is CVE-2023-36947?

CVE-2023-36947 is a critical-severity vulnerability in Totolink A7000r, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-10-16.

How severe is CVE-2023-36947?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-36947 known to be exploited?

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

Buffer overflow in Totolink A7000r

CVE-2023-36947

TOTOLINK X5000R V9.1.0u.6118_B20201102 and TOTOLINK A7000R V9.1.0u.6115_B20201022 was discovered to contain a stack overflow via the File parameter in the function UploadCustomModule.

Vulnerability class: Buffer Overflow

Published 2023-10-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (63.7th percentile), scored 2026-10-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.010 · change: +0.002

Affected products

Totolink A7000r
Totolink A7000r Firmware — versions 9.1.0u.6115_b20201022
Totolink X5000r
Totolink X5000r Firmware — versions 9.1.0u.6118_b20201102

Weakness classification (CWE)

Public proof-of-concept exploits

References

github.com/Archerber/bug_submit/blob/main/TOTOLINK/UploadCustomModule.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-36947?: CVE-2023-36947 is a critical-severity vulnerability in Totolink A7000r, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-10-16.
How severe is CVE-2023-36947?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-36947 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.