---
id: CVE-2021-46010
title: >-
  Totolink A3100R V5.9c.4577 suffers from Use of Insufficiently Random Values
  via the web configuration
summary: >-
  Totolink A3100R V5.9c.4577 suffers from Use of Insufficiently Random Values
  via the web configuration. The SESSION_ID is predictable. An attacker can
  hijack a valid session and conduct further malicious operations.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-330
vendor: totolink
product: a3100r_firmware
affected:
  - a3100r_firmware = 5.9c.4577
published: '2022-03-30'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-46010'
references:
  - url: 'https://hackmd.io/Ynwm8NnQSiK0xm7QKuNteg'
    label: cve@mitre.org
  - url: 'http://a3100r.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://totolink.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://hackmd.io/Ynwm8NnQSiK0xm7QKuNteg'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01243
epssPercentile: 0.67435
ingestedAt: '2026-07-06T02:09:23.460Z'
---

## Overview

Totolink A3100R V5.9c.4577 suffers from Use of Insufficiently Random Values via the web configuration. The SESSION_ID is predictable. An attacker can hijack a valid session and conduct further malicious operations.

## Affected

- `a3100r_firmware = 5.9c.4577`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.