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CVE-2021-33538: In Weidmueller Industrial WLAN devices in multiple versions an exploitable improper access control vulnerabili

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HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2021-33538 is a high-severity flaw (CVSS 8.8) affecting ie-wl-bl-ap-cl-eu firmware, ie-wlt-bl-ap-cl-eu firmware, ie-wl-bl-ap-cl-us firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Weidmueller Industrial WLAN devices in multiple versions an exploitable improper access control vulnerability exists in the iw_webs account settings functionality. A specially crafted user name entry can cause the overwrite of an existing user account password, resulting in remote shell access to the device as that user. An attacker can send commands while authenticated as a low privilege user to trigger this vulnerability.

Why this priority

  • High severity

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance1.0% (top 36%)
CISA exploited listNo
WeaknessCWE-269
Published2021-06-25
Last modified2026-06-17
Publisher (CNA): CERT VDE · Vendor: weidmueller

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

weidmueller ie-wl-bl-ap-cl-eu firmware UPGRADE
Affected: <= 1.16.18 · <= 1.11.10
Fixed in: newer than 1.16.18
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
weidmueller ie-wlt-bl-ap-cl-eu firmware UPGRADE
Affected: <= 1.16.18 · <= 1.11.10
Fixed in: newer than 1.16.18
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
weidmueller ie-wl-bl-ap-cl-us firmware UPGRADE
Affected: <= 1.16.18 · <= 1.11.10
Fixed in: newer than 1.16.18
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
weidmueller ie-wlt-bl-ap-cl-us firmware UPGRADE
Affected: <= 1.16.18 · <= 1.11.10
Fixed in: newer than 1.16.18
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
weidmueller ie-wl-vl-ap-br-cl-eu firmware UPGRADE
Affected: <= 1.16.18 · <= 1.11.10
Fixed in: newer than 1.16.18
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
weidmueller ie-wlt-vl-ap-br-cl-eu firmware UPGRADE
Affected: <= 1.16.18 · <= 1.11.10
Fixed in: newer than 1.16.18
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-33538?

ie-wl-bl-ap-cl-eu firmware: upgrade to newer than 1.16.18; ie-wlt-bl-ap-cl-eu firmware: upgrade to newer than 1.16.18; ie-wl-bl-ap-cl-us firmware: upgrade to newer than 1.16.18. Exact commands for each OS are on this page.

Is CVE-2021-33538 being exploited?

CVE-2021-33538 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-33538 affect?

CVE-2021-33538 affects ie-wl-bl-ap-cl-eu firmware, ie-wlt-bl-ap-cl-eu firmware, ie-wl-bl-ap-cl-us firmware. Severity is high (CVSS 8.8). In Weidmueller Industrial WLAN devices in multiple versions an exploitable improper access control vulnerability exists in the iw_webs account settings functionality. A specially crafted user name entry can cause the overwrite of an existin

How urgent is CVE-2021-33538?

Priority 47/100. High severity

Related CVEs

References

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