CVE-2021-20852

mediumpriority · track · 27EPSS 0.005 · 40 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.47% (40th) EPSS

CVSS 5.2 · medium

Is it mine?

3 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

Buffer overflow vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a network-adjacent attacker with an administrator privilege to execute an arbitrary OS command via unspecified vectors.

cvss

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

6.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05.2mediumAV:A/AC:L/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 5.1 · impact 6.4

v3.16.8mediumCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 0.9 · impact 5.9

v3.16.2mediumCVSS:3.1/AV:A/AC:L/PR:H/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-120USprimary

affected products (3)

Products and version ranges known to be affected.

ELECOM CO.,LTD. ELECOM LAN routers≤ WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and priorenisa_euvdEU
elecom wrh-733gbk firmware≤ 1.02.9nvdUScpe:2.3:o:elecom:wrh-733gbk_firmware:*:*:*:*:*:*:*:*
elecom wrh-733gwh firmware≤ 1.02.9nvdUScpe:2.3:o:elecom:wrh-733gwh_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 2021-12-01modified 2026-06-17

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+5664 more

references (10)

External citations — patches, advisories, analysis.

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