In Weidmueller Industrial WLAN devices in multiple versions an exploitable denial-of-service vulnerability exists in ServiceAgent functionality. A specially crafted packet can cause an integer underflow, triggering a large memcpy that will access unmapped or out-of-bounds memory. An attacker can send this packet while unauthenticated to trigger this vulnerability.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-33536
• https://cert.vde.com/en-us/advisories/vde-2021-026