Critical severity · published May 22, 2020
CVE-2020-13389
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…
9.8
CVSS
2.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.6% · higher than 85% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
Ac15 Firmware · Tendacn
v15.03.05.19_multi_td01 · source: NVD
AF
Ac18 Firmware · Tendacn
v15.03.05.19(6318) · source: NVD
AF
Ac6 Firmware · Tendacn
v15.03.05.19_multi_td01 · source: NVD
AF
Ac9 Firmware · Tendacn
v15.03.05.19(6318); v15.03.06.42_multi · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13389
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-13389
Exploit
https://joel-malwarebenchmark.github.io
Third Party Advisory
https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13389-Tenda-vulnerability/
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