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NVD / CVE Program· CNA CERTVDE

CVE-2021-33535: WEIDMUELLER: WLAN devices affected by exploitable format string vulnerability

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.6% (FIRST EPSS); higher than 76% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In Weidmueller Industrial WLAN devices in multiple versions an exploitable format string vulnerability exists in the iw_console conio_writestr functionality. A specially crafted time server entry can cause an overflow of the time server buffer, resulting in remote code execution. An attacker can send commands while authenticated as a low privilege user to trigger this vulnerability.

HighCVSS 8.8 · v3.1—No exploit No fix recorded
Published
Jun 25, 2021
Updated
Jun 16, 2026
EPSS
1.6% · 76th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.6%

CNA vs NVD score

NVD
8.8
CNA · CERTVDE
8.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-33535

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
weidmuellerie-wl-bl-ap-cl-eu firmware
weidmuellerie-wl-bl-ap-cl-eu
weidmuellerie-wlt-bl-ap-cl-eu firmware
weidmuellerie-wlt-bl-ap-cl-eu
weidmuellerie-wl-bl-ap-cl-us firmware
weidmuellerie-wl-bl-ap-cl-us
weidmuellerie-wlt-bl-ap-cl-us firmware
weidmuellerie-wlt-bl-ap-cl-us
weidmuellerie-wl-vl-ap-br-cl-eu firmware
weidmuellerie-wl-vl-ap-br-cl-eu
weidmuellerie-wlt-vl-ap-br-cl-eu firmware
weidmuellerie-wlt-vl-ap-br-cl-eu

and 4 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • weidmueller ie-wl-bl-ap-cl-eu firmwareup to 1.16.18 inclusive
  • weidmueller ie-wl-bl-ap-cl-eu firmwareup to 1.11.10 inclusive
  • weidmueller ie-wl-bl-ap-cl-us firmwareup to 1.11.10 inclusive
  • weidmueller ie-wl-bl-ap-cl-us firmwareup to 1.16.18 inclusive
  • weidmueller ie-wl-vl-ap-br-cl-eu firmwareup to 1.16.18 inclusive
  • weidmueller ie-wl-vl-ap-br-cl-eu firmwareup to 1.11.10 inclusive
  • weidmueller ie-wl-vl-ap-br-cl-us firmwareup to 1.11.10 inclusive
  • weidmueller ie-wl-vl-ap-br-cl-us firmwareup to 1.16.18 inclusive
  • weidmueller ie-wlt-bl-ap-cl-eu firmwareup to 1.16.18 inclusive
  • weidmueller ie-wlt-bl-ap-cl-eu firmwareup to 1.11.10 inclusive
  • weidmueller ie-wlt-bl-ap-cl-us firmwareup to 1.11.10 inclusive
  • weidmueller ie-wlt-bl-ap-cl-us firmwareup to 1.16.18 inclusive
  • weidmueller ie-wlt-vl-ap-br-cl-eu firmwareup to 1.11.10 inclusive
  • weidmueller ie-wlt-vl-ap-br-cl-eu firmwareup to 1.16.18 inclusive
  • weidmueller ie-wlt-vl-ap-br-cl-us firmwareup to 1.11.10 inclusive
  • weidmueller ie-wlt-vl-ap-br-cl-us firmwareup to 1.16.18 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (CERTVDE). Independent of NVD's CPE analysis and usually ahead of it.

  • Weidmüller IE-WL(T)-BL-AP-CL-XX

    • IE-WL-BL-AP-CL-EU (2536600000) and later · up to and including V1.16.18 (Build 18081617)affected
    • IE-WLT-BL-AP-CL-EU (2536650000) and later · up to and including V1.16.18 (Build 18081617)affected
    • IE-WL-BL-AP-CL-US (2536660000) and later · up to and including V1.16.18 (Build 18081617)affected
    • IE-WLT-BL-AP-CL-US (2536670000) and later · up to and including V1.16.18 (Build 18081617)affected

  • Weidmüller IE-WL(T)-VL-AP-CL-XX

    • IE-WL-VL-AP-BR-CL-EU (2536680000) and later · up to and including V1.11.10 (Build 18122616)affected
    • IE-WLT-VL-AP-BR-CL-EU (2536690000) and later · up to and including V1.11.10 (Build 18122616)affected
    • IE-WL-VL-AP-BR-CL-US (2536700000) and later · up to and including V1.11.10 (Build 18122616)affected
    • IE-WLT-VL-AP-BR-CL-US (2536710000) and later · up to and including V1.11.10 (Build 18122616)affected

Same product

weidmueller: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-33533WEIDMUELLER: WLAN devices affected by OS Command Injection vulnerability
    36Monitor
  • CVE-2021-33532WEIDMUELLER: WLAN devices affected by OS Command Injection vulnerability
    36Monitor
  • CVE-2021-33530WEIDMUELLER: WLAN devices affected by OS Command Injection vulnerability
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-33531Jun 25, 2021 · WEIDMUELLER: WLAN devices affected by Hard-coded Credentials vulnerability
    35Monitor
  • ← EarlierCVE-2021-33534Jun 25, 2021 · WEIDMUELLER: WLAN devices affected by OS Command Injection vulnerability
    29Monitor
  • Later →CVE-2021-33536Jun 25, 2021 · WEIDMUELLER: WLAN devices affected by Denial-of-Service vulnerability
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2021-335390 days apartWEIDMUELLER: WLAN devices affected by authentication bypass vulnerability
    28Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-134 · Use of Externally-Controlled Format String

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records