HOMEVULNERABILITIESCVE-2021-20621
HIGH

CVE-2021-20621

CWE-352Published: January 28, 2021· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Cross-site request forgery (CSRF) vulnerability in Aterm WG2600HP firmware Ver1.0.2 and earlier, and Aterm WG2600HP2 firmware Ver1.0.2 and earlier allows remote attackers to hijack the authentication of administrators via unspecified vectors.

NVD Source

Technical Analysis

CVE-2021-20621 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

aterm4 product(s)
wg2600hp firmwarewg2600hpwg2600hp2 firmwarewg2600hp2
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.aterm.jp/support/tech/2019/0328.html
PATCHhttps://www.aterm.jp/support/tech/2019/0328.html
ADVISORYhttps://jpn.nec.com/security-info/secinfo/nv21-005.html
ADVISORYhttps://jvn.jp/en/jp/JVN38248512/index.html
ADVISORYhttps://jpn.nec.com/security-info/secinfo/nv21-005.html
ADVISORYhttps://jvn.jp/en/jp/JVN38248512/index.html

All References (6)

→
https://jpn.nec.com/security-info/secinfo/nv21-005.htmlThird Party Advisory
→
https://jvn.jp/en/jp/JVN38248512/index.htmlThird Party Advisory
→
https://www.aterm.jp/support/tech/2019/0328.htmlPatch · Vendor Advisory
→
https://jpn.nec.com/security-info/secinfo/nv21-005.htmlThird Party Advisory
→
https://jvn.jp/en/jp/JVN38248512/index.htmlThird Party Advisory
→
https://www.aterm.jp/support/tech/2019/0328.htmlPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2021-20621
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-352
CISA KEVNo
Affected1 vendor(s)
PublishedJan 28, 2021

Related CVEs (CWE-352)

CVE-2025-23922
10.0
CVE-2017-5145
10.0
CVE-2025-32642
10.0
CVE-2019-17495
9.8
CVE-2019-25729
9.8
CVE-2024-47359
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-20621 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-20621·NVD