VulnerabilityPublished 20 Mar 2026

CVE-2026-4497: Totolink WA300 · OS Command Injection

Affects Totolink WA300Source CVE Database V5

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Public exploit available · CVSS 6.9 Medium.

Data as of 1 Nov 2026, 22:58 UTC

CVSS 4.0 base score

6.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 2.1% chance of exploitation in 30 days – higher than 81% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 1 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
TotolinkWA300	Affected =5.2cu.7112_B20190227	Fixed in–

AI-suggested

Immediately disable remote management interfaces on the Totolink WA300 to reduce exposure to external attackers.
Restrict access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules or network segmentation, allowing only trusted internal IP addresses if remote management is necessary.
Monitor network traffic for unusual requests targeting the recvUpgradeNewFw function or other suspicious CGI calls indicative of exploitation attempts.
5. Employ network intrusion detection/prevention systems (IDS/IPS) with signatures for command injection attempts targeting Totolink devices. 6. Regularly audit router configurations and logs for unauthorized changes or signs of compromise. 7. Educate users and administrators about the risks of exposing management interfaces and the importance of strong network perimeter controls. 8. Consider isolating vulnerable devices on separate VLANs to limit potential lateral movement in case of compromise.

Description

CVE-2026-4497 is a remote OS command injection vulnerability in the Totolink WA300 router, specifically in the recvUpgradeNewFw function within /cgi-bin/cstecgi.cgi. It affects firmware version 5.2cu.7112_B20190227. The flaw allows unauthenticated attackers to execute arbitrary OS commands remotely without user interaction. Although the CVSS 4.0 score rates it as medium severity (6.9), the vulnerability poses significant risks to confidentiality, integrity, and availability of affected devices. No patches or known exploits in the wild have been reported yet.

Impact

The exploitation of CVE-2026-4497 can lead to unauthorized remote code execution on affected Totolink WA300 routers, potentially allowing attackers to take full control of the device. This can result in interception or manipulation of network traffic, disruption of network services, and the establishment of persistent backdoors. Confidentiality may be compromised if attackers access sensitive data passing through the router. Integrity is at risk as attackers could alter firmware or configuration settings, potentially leading to further compromise or lateral movement within the network. Availability could be impacted if attackers disrupt router functionality or launch denial-of-service conditions. Organizations relying on these routers for critical network infrastructure or remote access could face operational disruptions and increased exposure to broader cyberattacks. The lack of authentication and user interaction requirements makes this vulnerability particularly dangerous, as it can be exploited by remote attackers without any prior access.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Mar 2026, 19:33 UTC

Technical details

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