CVE-2021-35033

mediumpriority · track · 31EPSS 0.004 · 35 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.41% (35th) EPSS

CVSS 6.9 · medium

Is it mine?

12 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-26

A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.

cvss

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

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.8

v2.06.9mediumAV:L/AC:M/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 3.4 · impact 10

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · security@zyxel.com.twexploitability 1.8 · impact 5.9

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USprimaryCWE-260US

affected products (12)

Products and version ranges known to be affected.

Zyxel NBG6818 series firmware≤ 1.00(ABSC.0)C0 through 1.00(ABSC.4)C0enisa_euvdEU
Zyxel NBG7815 series firmware≤ 1.00(ABSK.0)C0 through 1.00(ABSK.6)C0enisa_euvdEU
Zyxel WSQ20 series firmware≤ 1.00(ABOF.0)C0 through 1.00(ABOF.10)C0enisa_euvdEU
Zyxel WSQ50 series firmware≤ 1.00(ABKJ.0)C0 through 2.20(ABKJ.6)C0enisa_euvdEU
Zyxel WSQ60 series firmware≤ 1.00(ABND.0)C0 through 2.20(ABND.7)C0enisa_euvdEU
Zyxel WSR30 series firmware≤ 1.00(ABMY.0)C0 through 1.00(ABMY.11)C0enisa_euvdEU
zyxel nbg6818 firmware< 1.00\(absc.5\)c0nvdUScpe:2.3:o:zyxel:nbg6818_firmware:*:*:*:*:*:*:*:*
zyxel nbg7815 firmware< 1.00\(absk.7\)c0nvdUScpe:2.3:o:zyxel:nbg7815_firmware:*:*:*:*:*:*:*:*
zyxel wsq20 firmware< 1.00\(abof.11\)c0nvdUScpe:2.3:o:zyxel:wsq20_firmware:*:*:*:*:*:*:*:*
zyxel wsq50 firmware< 2.20\(abkj.7\)c0nvdUScpe:2.3:o:zyxel:wsq50_firmware:*:*:*:*:*:*:*:*
zyxel wsq60 firmware< 2.20\(abnd.8\)c0nvdUScpe:2.3:o:zyxel:wsq60_firmware:*:*:*:*:*:*:*:*
zyxel wsr30 firmware< 1.00\(abmy.12\)c0nvdUScpe:2.3:o:zyxel:wsr30_firmware:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-11-23modified 2026-06-17

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references (8)

External citations — patches, advisories, analysis.

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