What is CVE-2021-45734?

CVE-2021-45734 is a high-severity vulnerability in Totolink X5000r. CVSS score: 7.5/10. Published 2022-02-04.

How severe is CVE-2021-45734?

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

Is CVE-2021-45734 known to be exploited?

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

Vulnerability in Totolink X5000r

CVE-2021-45734

TOTOLINK X5000R v9.1.0u.6118_B20201102 was discovered to contain a stack overflow in the function setUrlFilterRules. This vulnerability allows attackers to cause a Denial of Service (DoS) via the url parameter.

Published 2022-02-04 · 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: 0.015 (72.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Totolink X5000r
Totolink X5000r Firmware — versions 9.1.0u.6118_b20201102

Public proof-of-concept exploits

References

github.com/pjqwudi/my_vuln/blob/main/totolink/vuln_10/10.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-45734?: CVE-2021-45734 is a high-severity vulnerability in Totolink X5000r. CVSS score: 7.5/10. Published 2022-02-04.
How severe is CVE-2021-45734?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-45734 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.