CVE-2021-20864

highpriority · track · 35EPSS 0.005 · 44 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.52% (44th) EPSS

CVSS 8.3 · high

Is it mine?

15 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-26

Improper access control vulnerability in ELECOM routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) allows a network-adjacent unauthenticated attacker to bypass access restriction, and to start the telnet service and execute an arbitrary OS command via unspecified vectors.

cvss

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

8.8

010

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

v2.08.3highAV:A/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 6.5 · impact 10

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.18.1highCVSS:3.1/AV:A/AC:L/PR:N/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-287USLLM-inferred

affected products (15)

Products and version ranges known to be affected.

ELECOM CO.,LTD. ELECOM routers≤ (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior)enisa_euvdEU
elecom edwrc-2533gst2 firmware≤ 1.25nvdUScpe:2.3:o:elecom:edwrc-2533gst2_firmware:*:*:*:*:*:*:*:*
elecom wrc-1167gst2 firmware≤ 1.25nvdUScpe:2.3:o:elecom:wrc-1167gst2_firmware:*:*:*:*:*:*:*:*
elecom wrc-1167gst2a firmware≤ 1.25nvdUScpe:2.3:o:elecom:wrc-1167gst2a_firmware:*:*:*:*:*:*:*:*
elecom wrc-1167gst2h firmware≤ 1.25nvdUScpe:2.3:o:elecom:wrc-1167gst2h_firmware:*:*:*:*:*:*:*:*
elecom wrc-1750gs firmware≤ 1.03nvdUScpe:2.3:o:elecom:wrc-1750gs_firmware:*:*:*:*:*:*:*:*
elecom wrc-1750gsv firmware≤ 2.11nvdUScpe:2.3:o:elecom:wrc-1750gsv_firmware:*:*:*:*:*:*:*:*
elecom wrc-1900gst firmware≤ 1.03nvdUScpe:2.3:o:elecom:wrc-1900gst_firmware:*:*:*:*:*:*:*:*
elecom wrc-2533gs2-b firmware≤ 1.52nvdUScpe:2.3:o:elecom:wrc-2533gs2-b_firmware:*:*:*:*:*:*:*:*
elecom wrc-2533gs2-w firmware≤ 1.52nvdUScpe:2.3:o:elecom:wrc-2533gs2-w_firmware:*:*:*:*:*:*:*:*
elecom wrc-2533gst firmware≤ 1.03nvdUScpe:2.3:o:elecom:wrc-2533gst_firmware:*:*:*:*:*:*:*:*
elecom wrc-2533gst2 firmware≤ 1.25nvdUScpe:2.3:o:elecom:wrc-2533gst2_firmware:*:*:*:*:*:*:*:*
elecom wrc-2533gst2-g firmware≤ 1.25nvdUScpe:2.3:o:elecom:wrc-2533gst2-g_firmware:*:*:*:*:*:*:*:*
elecom wrc-2533gst2sp firmware≤ 1.25nvdUScpe:2.3:o:elecom:wrc-2533gst2sp_firmware:*:*:*:*:*:*:*:*
elecom wrc-2533gsta firmware≤ 1.03nvdUScpe:2.3:o:elecom:wrc-2533gsta_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

references (8)

External citations — patches, advisories, analysis.

scry

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