CVE-2020-36178: tp-link tl-wr840n_firmware OS Command Injection

Vulnerability summary

CVE-2020-36178 is a high (CVSS 10.0) OS Command Injection vulnerability in tp-link tl-wr840n_firmware. EPSS estimates a 9.82% chance of exploitation in the next 30 days, higher than 95.5% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 06-01-2021
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

oal_ipt_addBridgeIsolationRules on TP-Link TL-WR840N 6_EU_0.9.1_4.16 devices allows OS command injection because a raw string entered from the web interface (an IP address field) is used directly for a call to the system library function (for iptables). NOTE: oal_ipt_addBridgeIsolationRules is not the only function that calls util_execSystem.

• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.