How severe is CVE-2020-9363?

CVE-2020-9363 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-9363 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-9363?

CVE-2020-9363 primarily affects Sophos Cloud Optix. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-9363?

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-2020-9363 published?

CVE-2020-9363 was published on 2020-02-24 and last updated on 2026-06-17.

CVE-2020-9363

CVE-2020-9363 is a high-severity vulnerability in Sophos Cloud Optix with a CVSS 3.x base score of 7.8. 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-436.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-436
Affected product: Sophos Cloud Optix
Published: 2020-02-24
Last modified: 2026-06-17

Description

The Sophos AV parsing engine before 2020-01-14 allows virus-detection bypass via a crafted ZIP archive. This affects Endpoint Protection, Cloud Optix, Mobile, Intercept X Endpoint, Intercept X for Server, and Secure Web Gateway. NOTE: the vendor feels that this does not apply to endpoint-protection products because the virus would be detected upon extraction.

Frequently asked questions

What is CVE-2020-9363?: The Sophos AV parsing engine before 2020-01-14 allows virus-detection bypass via a crafted ZIP archive. This affects Endpoint Protection, Cloud Optix, Mobile, Intercept X Endpoint, Intercept X for Server, and Secure Web Gateway. NOTE: the vendor feels that this does not apply to endpoint-protection products because the virus would be detected upon extraction.
How severe is CVE-2020-9363?: CVE-2020-9363 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-9363 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-9363?: CVE-2020-9363 primarily affects Sophos Cloud Optix. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-9363?: 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-2020-9363 published?: CVE-2020-9363 was published on 2020-02-24 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:sophos:cloud_optix:*:*:*:*:*:*:*:*
cpe:2.3:a:sophos:endpoint_protection:*:*:*:*:*:*:*:*
cpe:2.3:a:sophos:intercept_x_endpoint:*:*:*:*:*:*:*:*
cpe:2.3:a:sophos:intercept_x_for_server:*:*:*:*:*:*:*:*
cpe:2.3:a:sophos:mobile:*:*:*:*:*:*:*:*
cpe:2.3:a:sophos:secure_web_gateway:*:*:*:*:*:*:*:*

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