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Critical severity · published Mar 20, 2026
CVE-2026-4497
Totolink WA300 cstecgi.cgi recvUpgradeNewFw os command injection
9.8
CVSS
2.1%
EPSS
No
On KEV
Description
A vulnerability was determined in Totolink WA300 5.2cu.7112_B20190227. Affected by this issue is the function recvUpgradeNewFw of the file /cgi-bin/cstecgi.cgi. This manipulation causes os command injection. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.1% · higher than 82% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WA300 · Totolink
5.2cu.7112_B20190227 · source: vendor
WF
Wa300 Firmware · Totolink
5.2cu.7112_b20190227 · source: NVD
Affected product
WA
WA300
Totolink
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4497
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4497
Exploit
https://github.com/hellonestor/killallbug/issues/1
Exploit
https://github.com/user-attachments/files/25790616/Unauthenticated.Remote.Code.Execution.in.TOTOLINK.WA300.via.Command.Injection.in.recvUpgradeNewFw.zip
Permissions Required
https://vuldb.com/?ctiid.352046
Third Party Advisory
https://vuldb.com/?id.352046
Third Party Advisory
https://vuldb.com/?submit.773875
Product
https://www.totolink.net/
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