CVE-2023-43240
Published: 21 September 2023
Summary
CVE-2023-43240 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Dlink Dir-816 A2 Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 1.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
D-Link DIR-816 A2 firmware version 1.10CNB05 contains a stack-based buffer overflow in the ipportFilter function triggered by the sip_address parameter. The flaw is tracked as CVE-2023-43240, carries a CVSS 3.1 score of 9.8, and is classified under CWE-787 as an out-of-bounds write.
An unauthenticated attacker with network access can supply a crafted sip_address value to the affected device, resulting in arbitrary code execution, memory corruption, or a denial-of-service condition without any user interaction or credentials.
Public references point to a D-Link security bulletin page and a detailed proof-of-concept description hosted on GitHub, but the bulletin itself provides no additional mitigation steps beyond the general recommendation to monitor vendor advisories for firmware updates.
The associated EPSS score currently sits at 0.58 with a recorded peak of 0.61, indicating sustained exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-47659
Vulnerability details
D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter sip_address in ipportFilter.
- 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.