How severe is CVE-2021-27823?

CVE-2021-27823 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 high, integrity none, and availability none.

Is CVE-2021-27823 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27823?

CVE-2021-27823 affects Mediateknet Netwave System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27823?

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-2021-27823 published?

CVE-2021-27823 was published on 2021-05-25 and last updated on 2026-06-17.

CVE-2021-27823

CVE-2021-27823 is a high-severity vulnerability in Mediateknet Netwave System 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mediateknet Netwave System
Published: 2021-05-25
Last modified: 2026-06-17

Description

An information disclosure vulnerability was discovered in /index.class.php (via port 8181) on NetWave System 1.0 which allows unauthenticated attackers to exfiltrate sensitive information from the system.

Frequently asked questions

What is CVE-2021-27823?: An information disclosure vulnerability was discovered in /index.class.php (via port 8181) on NetWave System 1.0 which allows unauthenticated attackers to exfiltrate sensitive information from the system.
How severe is CVE-2021-27823?: CVE-2021-27823 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 high, integrity none, and availability none.
Is CVE-2021-27823 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27823?: CVE-2021-27823 affects Mediateknet Netwave System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27823?: 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-2021-27823 published?: CVE-2021-27823 was published on 2021-05-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mediateknet:netwave_system:1.0:*:*:*:*:*:*:*