VulnerabilityPublished 9 Jan 2026

CVE-2026-22081: Tenda 300Mbps Wireless Router F3 and N300 Easy Setup Router · - Sensitive Cookie Without HttpOnly Flag

Affects Tenda 300Mbps Wireless Router F3 and N300 Easy Setup RouterSource CVE Database V5

Not known to be exploited · CVSS 8.8 High.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 4.0 base score

8.8High

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 31% 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:H/VI:L/VA:L/SC:N/SI:N/SA:N

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

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: High: There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
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.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Jan 2026
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

Affected software

Product	Affected	Fixed in
Tenda300Mbps Wireless Router F3 and N300 Easy Setup Router	Affected F3 v3.0 Firmware V12.01.01.41 – F3 v4.0 Firmware V03.03.01.40 6 affected builds	Fixed in–

AI-suggested

Immediately restrict access to the router's administrative interface by limiting it to trusted internal networks or specific management VLANs.
Disable remote administration over HTTP or the internet if enabled.
Enforce use of HTTPS for the router's web interface to protect cookie transmission; if not supported, consider deploying a VPN or secure management channel.
Monitor network traffic for unusual activity indicative of session hijacking or unauthorized access attempts.
Apply firmware updates from Tenda as soon as they are released addressing this vulnerability.
If firmware patches are unavailable, consider replacing affected devices with models that implement secure cookie attributes and encrypted management interfaces.
Educate users and administrators about the risks of using default or insecure router configurations.
Implement network segmentation to isolate critical systems from potentially compromised routers.
Use endpoint security solutions to detect lateral movement or unusual network behavior stemming from compromised routers.

Description

This vulnerability exists in Tenda wireless routers (300Mbps Wireless Router F3 and N300 Easy Setup Router) due to the missing HTTPOnly flag for session cookies associated with the web-based administrative interface. A remote at-tacker could exploit this vulnerability by capturing session cookies transmitted over an insecure HTTP connection. Successful exploitation of this vulnerability could allow the attacker to obtain sensitive information and gain unau-thorized access to the targeted device.

Impact

European organizations using affected Tenda router models face risks including unauthorized administrative access to network routers, leading to potential interception or manipulation of internal and external network traffic. This could compromise confidentiality and integrity of sensitive communications and data. Attackers gaining control over routers can redirect traffic, deploy malware, or create persistent access points within corporate or governmental networks. Small and medium enterprises or home offices relying on these routers may be particularly vulnerable due to limited network segmentation or monitoring. Critical infrastructure entities using these devices could experience disruptions or espionage activities. The lack of encryption on the administrative interface exacerbates the risk, especially in environments with untrusted or public network segments. Overall, the vulnerability threatens network security posture and could facilitate broader attacks if exploited.

CWE-1004Sensitive Cookie Without 'HttpOnly' Flag (opens in a new tab)
Variant weaknessLikelihood of exploit: MediumOWASP Top 10 A02:2025: Security Misconfiguration (opens in a new tab)
The product uses a cookie to store sensitive information, but the cookie is not marked with the HttpOnly flag.
Implementation
Leverage the HttpOnly flag when setting a sensitive cookie in a response.
OWASP Cheat Sheets
Cross-Site Request Forgery Prevention (opens in a new tab)
Session Management (opens in a new tab)
OWASP ASVS 4.0.3
V3.4.2 (opens in a new tab)
V8.3.8 (opens in a new tab)
V13.4.2 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2026-0004 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Jan 2026, 11:53 UTC

WeaknessesCWE-1004

Technical details

References

Community reviews

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