How severe is CVE-2021-27509?

CVE-2021-27509 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-2021-27509 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27509?

CVE-2021-27509 primarily affects Visualware Myconnection Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27509?

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-2021-27509 published?

CVE-2021-27509 was published on 2021-02-19 and last updated on 2026-06-17.

CVE-2021-27509

CVE-2021-27509 is a high-severity vulnerability in Visualware Myconnection Server 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-863.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Visualware Myconnection Server
Published: 2021-02-19
Last modified: 2026-06-17

Description

In Visualware MyConnection Server before 11.0b build 5382, each published report is not associated with its own access code.

Frequently asked questions

What is CVE-2021-27509?: In Visualware MyConnection Server before 11.0b build 5382, each published report is not associated with its own access code.
How severe is CVE-2021-27509?: CVE-2021-27509 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-2021-27509 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27509?: CVE-2021-27509 primarily affects Visualware Myconnection Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27509?: 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-2021-27509 published?: CVE-2021-27509 was published on 2021-02-19 and last updated on 2026-06-17.

References

https://myconnectionserver.visualware.com/support/newrelease.html

Affected products (4)

cpe:2.3:a:visualware:myconnection_server:*:*:*:*:*:*:*:*
cpe:2.3:a:visualware:myconnection_server:11.0b:build5321:*:*:*:*:*:*
cpe:2.3:a:visualware:myconnection_server:11.0b:build5360:*:*:*:*:*:*
cpe:2.3:a:visualware:myconnection_server:11.0b:build5363:*:*:*:*:*:*

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