CVE-2021-31659Public exploitNetwork attack vector

Configuration tampering via tokenless state-changing URLs

Published Jun 10, 2021 · Updated Jul 9, 2026

Cross-site request forgery in TP-Link TL-SG2005 and TL-SG2008 firmware 1.0.0 Build 20180529 Rel.40524 allows remote attackers to alter settings. The web interface's usr_account_set.cgi and system_name_set.cgi endpoints accept state-changing URL parameters without a CSRF token. An authenticated switch administrator must open a crafted link, after which the attacker can change the administrator password, tamper with configuration, or enable port mirroring.

CVSS severity8.8
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in TP-Link TL-SG2005 and TL-SG2008 firmware 1.0.0 Build 20180529 Rel.40524 allows remote attackers to alter settings. The web interface's usr_account_set.cgi and system_name_set.cgi endpoints accept state-changing URL parameters without a CSRF token. An authenticated switch administrator must open a crafted link, after which the attacker can change the administrator password, tamper with configuration, or enable port mirroring.

The record

CVE
CVE-2021-31659
Published
Jun 10, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, CAPEC-62, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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