CVE-2021-33536
WEIDMUELLER: WLAN devices affected by Denial-of-Service vulnerability
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
WEIDMUELLER: WLAN devices affected by Denial-of-Service vulnerability
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.
- Record
CVE-2021-33536- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-191
- Updated
- 2026-11-02
EUVDEUVD-2021-20228
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.
- Record
EUVD-2021-20228- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-32vx-68rr-3qv3 No score
In Weidmueller Industrial WLAN devices in multiple versions an exploitable denial-of-service...
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.
- Record
GHSA-32vx-68rr-3qv3- Weakness
- CWE-191
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-33536- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-191
- Updated
- 2026-11-02
Affected products
- weidmueller ie-wl-bl-ap-cl-eu firmware
- weidmueller ie-wl-bl-ap-cl-us firmware
- weidmueller ie-wl-vl-ap-br-cl-eu firmware
- weidmueller ie-wl-vl-ap-br-cl-us firmware
- weidmueller ie-wlt-bl-ap-cl-eu firmware
- weidmueller ie-wlt-bl-ap-cl-us firmware
- weidmueller ie-wlt-vl-ap-br-cl-eu firmware
- weidmueller ie-wlt-vl-ap-br-cl-us firmware
- weidmüller ie-wl(t)-bl-ap-cl-xx
- weidmüller ie-wl(t)-vl-ap-cl-xx
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33536 is a high vulnerability (CVSS 7.5) in Weidmueller Ie-wl-bl-ap-cl-eu Firmware, published June 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.04%, the 64th percentile. No source names a fixed version.