How severe is CVE-2017-9811?

CVE-2017-9811 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-9811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9811?

CVE-2017-9811 affects Kaspersky Anti-virus For Linux Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9811?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-9811 published?

CVE-2017-9811 was published on 2017-07-17 and last updated on 2026-06-17.

CVE-2017-9811

CVE-2017-9811 is a critical-severity vulnerability in Kaspersky Anti-virus For Linux Server with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 10% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 10% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Kaspersky Anti-virus For Linux Server
Published: 2017-07-17
Last modified: 2026-06-17

Description

The kluser is able to interact with the kav4fs-control binary in Kaspersky Anti-Virus for Linux File Server before Maintenance Pack 2 Critical Fix 4 (version 8.0.4.312). By abusing the quarantine read and write operations, it is possible to elevate the privileges to root.

Frequently asked questions

What is CVE-2017-9811?: The kluser is able to interact with the kav4fs-control binary in Kaspersky Anti-Virus for Linux File Server before Maintenance Pack 2 Critical Fix 4 (version 8.0.4.312). By abusing the quarantine read and write operations, it is possible to elevate the privileges to root.
How severe is CVE-2017-9811?: CVE-2017-9811 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-9811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9811?: CVE-2017-9811 affects Kaspersky Anti-virus For Linux Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9811?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-9811 published?: CVE-2017-9811 was published on 2017-07-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kaspersky:anti-virus_for_linux_server:*:*:*:*:*:*:*:*

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