cbcvebase.
CVE-2023-43237
published 2023-09-21

CVE-2023-43237: D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter macCloneMac in setMAC.

PriorityP266critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
12.24%
95.7th percentile
D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter macCloneMac in setMAC.

Affected

1 ranges
VendorProductVersion rangeFixed in
dlinkdir-816_a2_firmware——

Detection & IOCsextracted from sources · hover to see the quote

url/goform/setMAC
snort
alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS D-Link setMAC macCloneMac Parameter Buffer Overflow Attempt (CVE-2023-43237)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:14; content:"/goform/setMAC"; fast_pattern; http.request_body; content:"macCloneMac|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:url,github.com/peris-navince/founded-0-days/blob/main/Dlink/816/setMAC/1.md; reference:cve,2023-43237; classtype:web-application-attack; sid:2065139; rev:1; metadata:attack_target Networking_Equipment, tls_state plaintext, created_at 2025_10_10, cve CVE_2023_43237, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_10, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)
  • →Exploit traffic uses HTTP POST method targeting the URI /goform/setMAC (exact URI length of 14 bytes).
  • →The POST body must contain the parameter 'macCloneMac=' (macCloneMac|3d|) followed by a value of 100 or more characters not containing '&', indicating a buffer overflow attempt.
  • →Traffic is expected in plaintext (not TLS); deploy detection at the network perimeter and internally.
  • →Affected device is D-Link DIR-816 A2 v1.10CNB05; the vulnerable function is setMAC and the overflow parameter is macCloneMac. ↗
  • →Reference PoC/exploit details available at the GitHub repository linked in the Snort rule.
  • ·The PCRE in the Snort rule (/^[^&]{100,}(?:&|$)/R) uses a relative offset match after the 'macCloneMac=' content match; ensure the IDS/IPS engine supports the /R PCRE modifier for correct evaluation.
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