CVE-2021-35031

highpriority · track · 32EPSS 0.005 · 41 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.48% (41st) EPSS

CVSS 7.7 · high

Is it mine?

31 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware, which could allow an authenticated LAN user to execute arbitrary OS commands via the GUI of the vulnerable device.

cvss

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

8.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8

v2.07.7highAV:A/AC:L/Au:S/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 5.1 · impact 10

v3.18highCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.1 · impact 5.9

v3.18highAV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.16.8mediumCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.16.8mediumCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · security@zyxel.com.twexploitability 0.9 · impact 5.9

v3.17.3highCVSS:3.1/AV:A/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-78USprimaryCWE-78US

affected products (31)

Products and version ranges known to be affected.

Zyxel GS1900 series firmware≤ 2.60enisa_euvdEU
Zyxel XGS1210 series firmware≤ 1.00(ABTY.4)C0enisa_euvdEU
Zyxel XGS1250 series firmware≤ 1.00(ABWE.0)C0enisa_euvdEU
Zyxel Communications Corp. GS1900-10HP≤ 2.70(AAZI.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-16≤ 2.70(AAHJ.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-24≤ 2.70(AAHL.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-24E≤ 2.70(AAHK.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-24EP≤ 2.70(ABTO.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-24HP≤ 2.70(AAHM.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-24HPv2≤ 2.70(ABTP.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-48≤ 2.70(AAHN.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-48HP≤ 2.70(AAHO.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-48HPv2≤ 2.70(ABTQ.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-8≤ 2.70(AAHH.1)C0fstec_bduRU
Zyxel Communications Corp. GS1900-8HP≤ 2.70(AAHI.1)C0fstec_bduRU
Zyxel Communications Corp. XGS1210-12≤ 1.00(ABTY.5)C0fstec_bduRU
Zyxel Communications Corp. XGS1250-12≤ 1.00(ABWE.1)C0fstec_bduRU
zyxel gs1900-10hp firmware< 2.70\(aazi.0\)-20211208nvdUScpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*
zyxel gs1900-16 firmware< 2.70\(aahj.0\)-20211208nvdUScpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:*
zyxel gs1900-24 firmware< 2.70\(aahl.0\)-20211208nvdUScpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:*

showing 20 of 31

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2021-12-28modified 2026-06-17

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references (5)

External citations — patches, advisories, analysis.

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