CVE-2020-36178
9.8
CRITICAL · CVSS 3.1 · EPSS 9.8% (pctl 95)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 9.82% — more likely to be exploited than 95% of all CVEs |
| Weakness | CWE-78 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-01-06 |
| Last modified | 2026-06-17 |
Affected (2)
| Vendor | Product |
|---|---|
| tp-link | tl-wr840n |
| tp-link | tl-wr840n firmware |
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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