How severe is CVE-2021-25877?

CVE-2021-25877 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-25877 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25877?

CVE-2021-25877 affects Youphptube. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25877?

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-2021-25877 published?

CVE-2021-25877 was published on 2021-11-01 and last updated on 2026-07-05.

CVE-2021-25877

CVE-2021-25877 is a high-severity vulnerability in Youphptube with a CVSS 3.x base score of 7.2. 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-94.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 9.0
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Youphptube
Published: 2021-11-01
Last modified: 2026-07-05

Description

AVideo/YouPHPTube 10.0 and prior is affected by Insecure file write. An administrator privileged user is able to write files on filesystem using flag and code variables in file save.php.

Frequently asked questions

What is CVE-2021-25877?: AVideo/YouPHPTube 10.0 and prior is affected by Insecure file write. An administrator privileged user is able to write files on filesystem using flag and code variables in file save.php.
How severe is CVE-2021-25877?: CVE-2021-25877 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-25877 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25877?: CVE-2021-25877 affects Youphptube. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25877?: 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-2021-25877 published?: CVE-2021-25877 was published on 2021-11-01 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:youphptube:youphptube:*:*:*:*:*:*:*:*

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