How severe is CVE-2021-26639?

CVE-2021-26639 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-26639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26639?

CVE-2021-26639 affects Wisa Smart Wing Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26639?

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.

When was CVE-2021-26639 published?

CVE-2021-26639 was published on 2022-08-17 and last updated on 2026-06-17.

CVE-2021-26639

CVE-2021-26639 is a high-severity vulnerability in Wisa Smart Wing Cms with a CVSS 3.x base score of 8.1. 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-20.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Wisa Smart Wing Cms
Published: 2022-08-17
Last modified: 2026-06-17

Description

This vulnerability is caused by the lack of validation of input values for specific functions if WISA Smart Wing CMS. Remote attackers can use this vulnerability to leak all files in the server without logging in system.

Frequently asked questions

What is CVE-2021-26639?: This vulnerability is caused by the lack of validation of input values for specific functions if WISA Smart Wing CMS. Remote attackers can use this vulnerability to leak all files in the server without logging in system.
How severe is CVE-2021-26639?: CVE-2021-26639 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-26639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26639?: CVE-2021-26639 affects Wisa Smart Wing Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26639?: 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.
When was CVE-2021-26639 published?: CVE-2021-26639 was published on 2022-08-17 and last updated on 2026-06-17.

References

https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66875

Affected products (1)

cpe:2.3:a:wisa:smart_wing_cms:*:*:*:*:*:*:*:*

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