High severity · published Mar 26, 2026
CVE-2026-4903
Tenda AC5 POST Request QuickIndex formQuickIndex memory corruption
8.8
CVSS
5.7%
EPSS
No
On KEV
Description
A flaw has been found in Tenda AC5 15.03.06.47. This vulnerability affects the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. This manipulation of the argument PPPOEPassword causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been published and may be used.
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)5.7% · higher than 93% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
AC5 · Tenda
15.03.06.47 · source: vendor
AF
Ac5 Firmware · Tenda
15.03.06.47 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4903
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4903
Exploit
https://lavender-bicycle-a5a.notion.site/Tenda_AC5_QuickIndex_PPPOEPassword-32053a41781f808dae98f99c99bcb21c?source=copy_link
Permissions Required
https://vuldb.com/?ctiid.353654
Third Party Advisory
https://vuldb.com/?id.353654
Third Party Advisory
https://vuldb.com/?submit.777380
Product
https://www.tenda.com.cn/
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