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High severity · published Jan 17, 2018
CVE-2018-5721
Stack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on ASUS routers (when using software from https://github.com/RMerl/asuswrt-merlin) allows web…
8.8
CVSS
1.9%
EPSS
No
On KEV
Description
Stack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on ASUS routers (when using software from https://github.com/RMerl/asuswrt-merlin) allows web authenticated attackers to execute code via a request that updates a setting. In ej_update_variables, the length of the variable action_script is not checked, as long as it includes a "_wan_if" substring.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.9% · higher than 80% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asuswrt-merlin · Asuswrt-merlin
through 382.1_2 · source: NVD
Affected product
AS
Asuswrt-merlin
Asuswrt-merlin
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-5721
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-5721
Exploit
http://www.w0lfzhang.com/2018/01/17/ASUS-router-stack-overflow-in-http-server/
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