What is CVE-2021-35325?

CVE-2021-35325 is a high-severity vulnerability in Totolink A720r, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2021-08-05.

How severe is CVE-2021-35325?

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

Is CVE-2021-35325 known to be exploited?

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

Buffer overflow in Totolink A720r

CVE-2021-35325

A stack overflow in the checkLoginUser function of TOTOLINK A720R A720R_Firmware v4.1.5cu.470_B20200911 allows attackers to cause a denial of service (DOS).

Vulnerability class: Buffer Overflow

Published 2021-08-05 · 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: 0.133 (96.3th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.133 · newest: 0.133 · change: 0.000

Affected products

Totolink A720r
Totolink A720r Firmware — versions 4.1.5cu.470_b20200911

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

github.com/hurricane618/my_cves/blob/master/router/totolink/A720R_cookie_overfl… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-35325?: CVE-2021-35325 is a high-severity vulnerability in Totolink A720r, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2021-08-05.
How severe is CVE-2021-35325?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-35325 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.