What’s Vulnerable › Vulnerabilities

CVE-2020-36178

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 9.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-06 · updated 2026-06-17
• Weakness: CWE-78

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.

Affected products

• TP-Link Tl-Wr840N Firmware: 6_eu_0.9.1_4.16

References

• https://github.com/therealunicornsecurity/therealunicornsecurity.github.io/blob/master/_posts/2020-10-11-TPLink.md
• https://therealunicornsecurity.github.io/TPLink/
• https://www.tp-link.com/fr/support/download/tl-wr840n/v6/#Firmware
• https://github.com/therealunicornsecurity/therealunicornsecurity.github.io/blob/master/_posts/2020-10-11-TPLink.md
• https://therealunicornsecurity.github.io/TPLink/
• https://www.tp-link.com/fr/support/download/tl-wr840n/v6/#Firmware

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