How severe is CVE-2026-36823?

CVE-2026-36823 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-36823 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-36823?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-36823 have an EU (EUVD) identifier?

Yes. CVE-2026-36823 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35968.

When was CVE-2026-36823 published?

CVE-2026-36823 was published on 2026-06-09 and last updated on 2026-06-17.

CVE-2026-36823

CVE-2026-36823 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35968
Weakness: CWE-121
Published: 2026-06-09
Last modified: 2026-06-17

Description

Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6 was discovered to contain a buffer overflow in the webAuthUserInfo parameter of the formAddWebAuthUser function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

Frequently asked questions

What is CVE-2026-36823?: Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6 was discovered to contain a buffer overflow in the webAuthUserInfo parameter of the formAddWebAuthUser function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
How severe is CVE-2026-36823?: CVE-2026-36823 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-36823 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-36823?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-36823 have an EU (EUVD) identifier?: Yes. CVE-2026-36823 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35968.
When was CVE-2026-36823 published?: CVE-2026-36823 was published on 2026-06-09 and last updated on 2026-06-17.

References

https://github.com/xhh0124/SemVulLLM/tree/main/W20E/formAddWebAuthUser

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