VulnerabilityPublished 10 Nov 2025Updated 18 Nov 2025

CVE-2025-63147: Tenda AX3 · Stack-based Buffer Overflow

Source CVE Database V5

Not known to be exploited · CVSS 6.5 Medium.

Data as of 26 Oct 2026, 11:42 UTC

CVSS 3.1 base score

6.5Medium

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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

Attack Vector: Adjacent: The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone).
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: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Nov 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

Immediately restrict remote access to the Tenda AX3 router management interfaces, especially from untrusted networks, to reduce exposure to potential attackers.
Implement network segmentation to isolate routers from critical internal systems and limit the attack surface.
Monitor network traffic for unusual or malformed requests targeting the deviceId parameter or the saveParentControlInfo function, using intrusion detection systems (IDS) or network behavior analysis tools.
Disable or limit parental control features if not required, as the vulnerability is linked to the saveParentControlInfo function related to parental controls.
Regularly check for firmware updates from Tenda and apply patches promptly once available to remediate the vulnerability.
Employ network-level protections such as firewalls and access control lists (ACLs) to block suspicious traffic patterns.
Educate users and administrators about the risks of using default or outdated firmware and encourage best practices for secure router configuration.
Consider replacing vulnerable devices with models from vendors with stronger security track records if timely patches are not forthcoming.

Description

Tenda AX3 V16.03.12.10_CN was discovered to contain a stack overflow in the deviceId parameter of the saveParentControlInfo function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request.

Impact

For European organizations, the primary impact of CVE-2025-63147 is the potential disruption of network availability due to router crashes caused by the stack overflow. This can lead to temporary loss of internet connectivity, affecting business operations, remote work capabilities, and access to cloud services. Small and medium-sized enterprises (SMEs) and residential users relying on Tenda AX3 routers are particularly vulnerable, as these devices are commonly used in home and small office environments. The DoS condition could be exploited by attackers to cause targeted outages or as part of a larger attack campaign to disrupt network infrastructure. Although the vulnerability does not compromise data confidentiality or integrity, the loss of availability can have cascading effects on productivity and service continuity. Additionally, the absence of patches increases the window of exposure, emphasizing the need for proactive mitigation. European critical infrastructure and organizations with remote workforce setups may face operational risks if their network edge devices are affected. The medium severity rating suggests a moderate threat level, but the ease of exploitation without authentication and user interaction elevates the urgency of addressing this vulnerability.

CWE-121Stack-based Buffer Overflow (opens in a new tab)
Variant weaknessLikelihood of exploit: HighCWE Top 25 (2025): #14
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
Architecture and Design
Use an abstraction library to abstract away risky APIs. Not a complete solution.
Implementation
Implement and perform bounds checking on input.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/0-fool/VulnbyCola/blob/main/Tenda/AX-3/5/1.md (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 18 Nov 2025, 17:27 UTC

WeaknessesCWE-121

Technical details

References

Community reviews

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