CVE-2021-20999

highpriority · track · 39EPSS 0.009 · 61 %ileDEEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.95% (61st) EPSS
CVSS 7.5 · high
Is it mine?
56 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · nvd · weidmueller_psirt

EPSS · scored 2026-10-27

In Weidmüller u-controls and IoT-Gateways in versions up to 1.12.1 a network port intended only for device-internal usage is accidentally accessible via external network interfaces. By exploiting this vulnerability the device may be manipulated or the operation may be stopped.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedweidmueller_psirt

    Weidmüller recommends upgrading affected devices to the current firmware version 1.12.3 or higher which fixes this vulnerability. Alternatively the following firmware versions which fix this vulnerability may be installed: | **Product** | **Affected (installed) firmware version** | **Fixed firmware version** | |-----------------------|-----------------------------------------------|--------------------------------| | Any affected product | 1.3.0 - 1.9.0 | 1.9.1 | | Any affected product | 1.10.1, 1.10.2 | 1.10.3 | | Any affected product | 1.10.0, 1.11.0, 1.12.1 | 1.12.3 |

  • Mitigationweidmueller_psirt

    Restrict access to the network th device is connected to Do not directly connect the device to the internet

02

cvss

Technical severity, 0–10. One row per scoring source.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9
v3.19.4criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:Hsecondary · ENISA EU
v3.19.4criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:Hsecondary · info@cert.vde.comexploitability 3.9 · impact 5.5
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Weidmüller PSIRT DE
v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-668USCWE-668US
04

affected products (56)

Products and version ranges known to be affected.

showing 20 of 56
05

advisories (1)

Vendor and ecosystem advisories describing this.

  • VDE-2021-016Weidmueller: Accidentally open network port in u-controls and IoT-Gateways2021-05-04csaf · weidmueller_psirtDE

    A network port intended only for device-internal usage is accidentally accessible via external network interfaces.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdnvdweidmueller_psirtNVDCVE.orgMITRE
published 2021-05-13modified 2026-06-17
08

references (4)

External citations — patches, advisories, analysis.

scry

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