CVE-2023-33669
Published: 02 June 2023
Summary
CVE-2023-33669 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Tenda Ac8 Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 3.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
Tenda AC8V4.0 running firmware V16.03.34.06 contains a stack-based buffer overflow in the sub_44db3c function that is triggered when processing the timeZone parameter. The flaw is an instance of CWE-787 and received a CVSS 3.1 base score of 9.8, reflecting network attack vector, low attack complexity, and no required authentication or user interaction.
An unauthenticated remote attacker can send a crafted HTTP request containing an oversized timeZone value to the device’s web interface, causing an out-of-bounds write on the stack. Successful exploitation can result in arbitrary code execution, full device compromise, or denial of service.
Public GitHub repositories under DDizzzy79/Tenda-CVE contain technical write-ups and proof-of-concept material for the AC8V4.0/N1 variant, but no vendor advisory or patch information is referenced. The EPSS score is currently 0.3091 with the same peak value recorded.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-37825
Vulnerability details
Tenda AC8V4.0-V16.03.34.06 was discovered to contain a stack overflow via the timeZone parameter in the sub_44db3c function.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.