What is CVE-2024-7331?

CVE-2024-7331 is a high-severity vulnerability in Totolink A3300r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2024-08-01.

How severe is CVE-2024-7331?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2024-7331 known to be exploited?

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

Buffer overflow in Totolink A3300r

CVE-2024-7331

A vulnerability was found in TOTOLINK A3300R 17.0.0cu.557_B20221024 and classified as critical. Affected by this issue is the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument File leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. VDB-273254 is the identifier assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Vulnerability class: Buffer Overflow

Published 2024-08-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.1th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Totolink A3300r — versions 17.0.0cu.557_B20221024
Totolink A3300r Firmware — versions 17.0.0cu.557_b20221024

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

vuldb.com/ (Permissions Required, technical-description, VDB Entry, vdb-entry)
vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3300R/UploadCustomMod… (Technical Description, Exploit, Third Party Advisory, exploit)

Frequently asked questions

What is CVE-2024-7331?: CVE-2024-7331 is a high-severity vulnerability in Totolink A3300r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2024-08-01.
How severe is CVE-2024-7331?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2024-7331 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.