What is CVE-2025-4823?

CVE-2025-4823 is a high-severity vulnerability in Totolink A3002r, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2025-05-17.

How severe is CVE-2025-4823?

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

Is CVE-2025-4823 known to be exploited?

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

Buffer overflow in Totolink A3002r

CVE-2025-4823

A vulnerability was found in TOTOLINK A702R, A3002R and A3002RU 3.0.0-B20230809.1615. It has been rated as critical. Affected by this issue is the function submit-url of the file /boafrm/formReflashClientTbl of the component HTTP POST Request Handler. The manipulation leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Vulnerability class: Buffer Overflow

Published 2025-05-17 · 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: 0.008 (55.4th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% 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: 0.008 · change: +0.000

Affected products

Totolink A3002r — versions 3.0.0-B20230809.1615
Totolink A3002r Firmware — versions 3.0.0-b20230809.1615
Totolink A3002ru — versions 3.0.0-B20230809.1615
Totolink A3002ru Firmware — versions 3.0.0-b20230809.1615
Totolink A702r — versions 3.0.0-B20230809.1615
Totolink A702r Firmware — versions 3.0.0-b20230809.1615

Weakness classification (CWE)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
github.com/CH13hh/tmp_store_cc/blob/main/toto/1.md (exploit, Broken Link)
www.totolink.net/ (Product, product)

Frequently asked questions

What is CVE-2025-4823?: CVE-2025-4823 is a high-severity vulnerability in Totolink A3002r, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2025-05-17.
How severe is CVE-2025-4823?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2025-4823 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.