CVE-2023-40891

Name: CVE-2023-40891
Creator: NVD / NIST
Published: 2023-08-24T18:15:07.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2023-40891 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Tenda AC8 v4 US_AC8V4.0si_V16.03.34.06_cn was discovered to contain a stack overflow via parameter firewallEn at /goform/SetFirewallCfg.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

Description

Tenda AC8 v4 US_AC8V4.0si_V16.03.34.06_cn was discovered to contain a stack overflow via parameter firewallEn at /goform/SetFirewallCfg.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.70%

48.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Tenda	Ac8 Firmware	16.03.34.06

References

https://github.com/peris-navince/founded-0-days/blob/main/ac8/formSetFirewallCfg/1.mdExploit, Third Party Advisory
https://github.com/peris-navince/founded-0-days/blob/main/ac8/formSetFirewallCfg/1.mdExploit, Third Party Advisory

Timeline

Published: Aug 24, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-40891?

Tenda AC8 v4 US_AC8V4.0si_V16.03.34.06_cn was discovered to contain a stack overflow via parameter firewallEn at /goform/SetFirewallCfg.

How severe is CVE-2023-40891?

CVE-2023-40891 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2023-40891?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-40891?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST