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CVE-2021-20620

19
FAUCET Score

CVE-2021-20620 is a cross-site scripting (XSS) vulnerability affecting Aterm WF800HP firmware versions 1.0.9 and earlier, as well as Aterm WG2600HP and WG2600HP_firmware. This medium-severity flaw (CVSS 6.1) allows remote attackers to inject arbitrary scripts through unspecified vectors, potentially leading to client-side impact like information disclosure or defacement. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.0.9CPE matchmatch criteria
cpe:2.3:o:aterm:wg2600hp_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.04%
Probability of exploitation in next 30 days
EPSS Percentile
60.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0104 is in the 73rd percentile among its peer group of 26,234 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

jpn.nec.com / security-info/secinfo/nv21-005.html
Third Party Advisory
jvn.jp / en/jp/JVN38248512/index.html
Third Party Advisory
aterm.jp / support/tech/2019/0328.html
PatchVendor Advisory