CVE-2020-13389

moderate-risk
Published 2020-05-22

An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)_CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/openSchedWifi schedStartTime and schedEndTime parameters for a POST request, a value is directly used in a strcpy to a local variable placed on the stack, which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.

Do I need to act?

~
2.1% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (5)

Ac9 Firmware
Ac18 Firmware
Ac9 Firmware

Affected Vendors

Tendacn

References (4)

Exploit https://joel-malwarebenchmark.github.io
Third Party Advisory https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13389-Tenda-vul...
Exploit https://joel-malwarebenchmark.github.io
Third Party Advisory https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13389-Tenda-vul...
49
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 5/34 · Minimal
Exposure 12/34 · Low