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CVE-2025-4270

TOTOLINK A720R Config cstecgi.cgi information disclosure

Published: May 5, 2025Updated: May 7, 2025 Sources: CVE List NVD BDUCWE-200
5.3MEDIUM
NVD MITRE
EPSS Score
13.1%
Top 4.0%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
Patch Available
Self-Check
Not available

Description

A vulnerability was found in TOTOLINK A720R 4.1.5cu.374. It has been classified as problematic. Affected is an unknown function of the file /cgi-bin/cstecgi.cgi of the component Config Handler. The manipulation of the argument topicurl with the input getInitCfg/getSysStatusCfg leads to information disclosure. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

In plain language

AI Worth attention

If you use a TOTOLINK A720R router, a remote attacker may be able to view parts of your router configuration without logging in—so you should check whether you’re on the affected firmware and limit internet access to the device.

Executive summary

Unauthenticated remote information disclosure in TOTOLINK A720R’s /cgi-bin/cstecgi.cgi (Config Handler) allows attackers to retrieve sensitive configuration data by manipulating the topicurl argument (e.g., getInitCfg/getSysStatusCfg).

If affected, business impact
Leaked router configuration detailsPrivacy exposure of device settingsPotential follow-on attacksConfiguration tampering risk

What to do now

  1. Check your router’s firmware version and confirm whether it matches TOTOLINK A720R 4.1.5cu.374 (and/or “a720r firmware” variants your device reports).
  2. If you’re on an affected version, update to the vendor’s latest firmware that addresses this /cgi-bin/cstecgi.cgi information disclosure (ask your router vendor if you can’t find release notes).
  3. Restrict access to the router from the internet: ensure administrative/CGI endpoints are not reachable from the public internet (use network rules/firewalling or router “remote management” off).
  4. Add or enable web-application–aware filtering (a WAF or similar reverse-proxy protection) so unsolicited requests to unusual CGI parameters are blocked.
  5. If you cannot patch immediately, treat the device as internet-exposed only if necessary: limit inbound traffic to only what your business uses (whitelisting), and block all other inbound to the router.
Some work to apply

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-200CWE-284NVD-CWE-noinfo

Affected Products

TOTOLink
commercial·TWaka totolink corp.
A720R
Networking Infrastructure
a720r firmware
Networking Infrastructure
and 1 more affected products View all →

Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Is your org exposed to CVE-2025-4270?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/at0de/my_vulns/blob/main/TOTOLINK/A720R/getInitCfg.md
github.com
https://github.com/at0de/my_vulns/blob/main/TOTOLINK/A720R/getSysStatusCfg.md
github.com
https://vuldb.com/?ctiid.307374
vuldb.com
and 3 more references View all →

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