How severe is CVE-2021-25265?

CVE-2021-25265 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-25265 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25265?

CVE-2021-25265 affects Sophos Connect. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25265?

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-2021-25265 published?

CVE-2021-25265 was published on 2021-03-22 and last updated on 2026-06-17.

CVE-2021-25265

CVE-2021-25265 is a high-severity vulnerability in Sophos Connect with a CVSS 3.x base score of 8.8. 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 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Sophos Connect
Published: 2021-03-22
Last modified: 2026-06-17

Description

A malicious website could execute code remotely in Sophos Connect Client before version 2.1.

Frequently asked questions

What is CVE-2021-25265?: A malicious website could execute code remotely in Sophos Connect Client before version 2.1.
How severe is CVE-2021-25265?: CVE-2021-25265 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-25265 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25265?: CVE-2021-25265 affects Sophos Connect. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25265?: 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-2021-25265 published?: CVE-2021-25265 was published on 2021-03-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sophos:connect:*:*:*:*:*:*:*:*

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