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CVE-2021-20861

27
FAUCET Score

CVE-2021-20861 describes an improper access control vulnerability in multiple ELECOM LAN router models, allowing an authenticated network-adjacent attacker to bypass access restrictions and access the management screen. This vulnerability is rated as High severity (CVSS 8.8), indicating a low attack complexity with potential for complete compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.25CPE matchmatch criteria
cpe:2.3:o:elecom:wrc-1167gst2_firmware:*:*:*:*:*:*:*:*
<= 1.25CPE matchmatch criteria
cpe:2.3:o:elecom:wrc-1167gst2a_firmware:*:*:*:*:*:*:*:*
<= 1.25CPE matchmatch criteria
cpe:2.3:o:elecom:wrc-1167gst2h_firmware:*:*:*:*:*:*:*:*
<= 1.52CPE matchmatch criteria
cpe:2.3:o:elecom:wrc-2533gs2-b_firmware:*:*:*:*:*:*:*:*
<= 1.52CPE matchmatch criteria
cpe:2.3:o:elecom:wrc-2533gs2-w_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.45%
Probability of exploitation in next 30 days
EPSS Percentile
36.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0045 is in the 34th percentile among its peer group of 1,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

jvn.jp / en/jp/JVN88993473/index.html
Third Party Advisory
elecom.co.jp / news/security/20211130-01
Vendor Advisory