How severe is CVE-2021-41560?

CVE-2021-41560 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-2021-41560 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41560?

CVE-2021-41560 affects Opencats. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41560?

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-2021-41560 published?

CVE-2021-41560 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-41560

CVE-2021-41560 is a critical-severity vulnerability in Opencats with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Opencats
Published: 2021-12-15
Last modified: 2026-06-17

Description

OpenCATS through 0.9.6 allows remote attackers to execute arbitrary code by uploading an executable file via lib/FileUtility.php.

Frequently asked questions

What is CVE-2021-41560?: OpenCATS through 0.9.6 allows remote attackers to execute arbitrary code by uploading an executable file via lib/FileUtility.php.
How severe is CVE-2021-41560?: CVE-2021-41560 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-2021-41560 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41560?: CVE-2021-41560 affects Opencats. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41560?: 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-2021-41560 published?: CVE-2021-41560 was published on 2021-12-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:opencats:opencats:*:*:*:*:*:*:*:*

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