Log in Start free

Vulnerability · Published Mar 29, 2023 · Assigned by zdi

CVE-2022-43636

High 7.5

In plain English

A high-severity weak randomness in TL-WR940N from TP-Link. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS 3.0)7.5High
Exploit odds (30 days)0.9%top 39.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of TP-Link TL-WR940N 6_211111 3.20.1(US) routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the httpd service, which listens on TCP port 80 by default. The issue results from the lack of sufficient randomness in the sequnce numbers used for session managment. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-18334.

Affected products (as reported)

VendorProductVersions
TP-Link TL-WR940N 6_211111 3.20.1(US)

Weakness: CWE-330 · Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References