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CVE-2020-36178

CRITICAL
9.8
CVSS Score
Published: January 6, 2021 at 08:57 PM UTC
Updated: June 17, 2026 at 03:14 AM UTC
2 products affected across 1 vendorTl WR840N FirmwareTL-WR840N

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Severity
CRITICAL9.8
Exploit prediction
EPSS 10%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tl WR840N Firmware· TP-Link
95%
6_eu_0.9.1_4.16
tp-link-tl-wr840n (same device)
TL-WR840N· TP-Linkdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/therealunicornsecurity/therealunicornsecurity.github.io/blob/master/_posts/2020-10-11-TPLink.md
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://therealunicornsecurity.github.io/TPLink/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.tp-link.com/fr/support/download/tl-wr840n/v6/#Firmware

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-78

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