Is CVE-2021-33536 actively exploited?

No active exploitation of CVE-2021-33536 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-33536 be exploited remotely?

Yes. CVE-2021-33536 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-33536?

CVE-2021-33536 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2021-33536

HIGH

CVE-2021-33536

CWE-191Published: June 25, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-33536 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

weidmueller16 product(s)

ie-wl-bl-ap-cl-eu firmwareie-wl-bl-ap-cl-euie-wlt-bl-ap-cl-eu firmwareie-wlt-bl-ap-cl-euie-wl-bl-ap-cl-us firmwareie-wl-bl-ap-cl-usie-wlt-bl-ap-cl-us firmwareie-wlt-bl-ap-cl-usie-wl-vl-ap-br-cl-eu firmwareie-wl-vl-ap-br-cl-euie-wlt-vl-ap-br-cl-eu firmwareie-wlt-vl-ap-br-cl-eu+4

Source: NVD CPE · 16 total CPE entries