PT-2021-20889 · Totolink · Totolink A720R

Chuan Qin + 1 · Published 2021-08-05 · Updated 2025-12-18 · CVE-2021-35327

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: TOTOLINK A720R version v4.1.5cu.470 B20200911

Description: A vulnerability allows attackers to start the Telnet service and then login with the default credentials via a crafted POST request.

Recommendations: For version v4.1.5cu.470 B20200911, consider changing the default credentials to prevent unauthorized access, and restrict access to the Telnet service until a patch is available.

Exploit

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2021-35327

Affected Products

Totolink A720R

References · 4

• 🔥 https://github.com/hurricane618/my_cves/blob/master/router/totolink/A720R_default_telnet_info.md · Exploit
• https://osv.dev/vulnerability/CVE-2021-35327 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-35327 · Security Note
• https://twitter.com/lovithreatintel/status/2001786203386057216 · Twitter Post