VulnerabilityPublished 9 Jul 2025Updated 14 Jul 2025

CVE-2025-52364: Tenda CP3 Pro Firmware · Insecure Permissions

Source CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

7.5High

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

EPSS: 0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
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), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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

AI-suggested

To mitigate this vulnerability, European organizations should take the following specific actions: 1) Immediately verify if their Tenda CP3 Pro devices are running firmware version V22.5.4.93 or earlier and disable the telnet service if it is enabled by default. This can be done by accessing the device's configuration interface or via command line if accessible. 2) Change all default credentials to strong, unique passwords to prevent unauthorized access. 3) If possible, update the firmware to a patched version once Tenda releases one addressing this issue. 4) Implement network segmentation to isolate vulnerable devices from critical infrastructure and sensitive data flows. 5) Employ network-level controls such as firewall rules to block inbound telnet (TCP port 23) traffic from untrusted networks, especially the internet. 6) Conduct regular network scans to detect open telnet services and unauthorized access attempts. 7) Educate users and administrators about the risks of default credentials and insecure services. These steps go beyond generic advice by focusing on immediate disabling of vulnerable services, credential management, network controls, and monitoring tailored to this specific vulnerability.

Description

Insecure Permissions vulnerability in Tenda CP3 Pro Firmware V22.5.4.93 allows the telnet service (telnetd) by default at boot via the initialization script /etc/init.d/eth.sh. This allows remote attackers to connect to the device s shell over the network, potentially without authentication if default or weak credentials are present

Impact

For European organizations, this vulnerability could have serious consequences. Routers like the Tenda CP3 Pro are commonly used in small to medium-sized enterprises and home office environments. Unauthorized access to these devices could lead to interception of sensitive data, disruption of network services, or lateral movement within corporate networks. Given the high confidentiality impact, attackers could exfiltrate sensitive information passing through the compromised router. The absence of integrity and availability impacts in the CVSS vector suggests that while data manipulation or service disruption is less likely, the breach of confidentiality alone is critical. Additionally, compromised routers can be enlisted into botnets or used to launch attacks against other targets, increasing the broader threat landscape. European organizations with remote or distributed workforces relying on such devices are particularly vulnerable, as attackers can exploit this remotely without physical access. The risk is amplified if default credentials are not changed, a common misconfiguration in many deployments.

CWE-1391Use of Weak Credentials (opens in a new tab)
Class weaknessOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product uses weak credentials (such as a default key or hard-coded password) that can be calculated, derived, reused, or guessed by an attacker.
Architecture and Design · Operation
When the user changes or sets a password, check the password against a database of already compromised or breached passwords. These passwords are likely to be used in password guessing attacks.
OWASP Cheat Sheets
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V2.8.5 (opens in a new tab)
V2.8.4 (opens in a new tab)
V9.2.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 16 Jul 2025, 20:51 UTC

WeaknessesCWE-1391

Technical details

References

Community reviews

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