How severe is CVE-2020-15148?

CVE-2020-15148 has a CVSS 3.x base score of 8.9, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2020-15148 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 79% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15148?

CVE-2020-15148 affects Yiiframework Yii. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15148?

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-2020-15148 published?

CVE-2020-15148 was published on 2020-09-15 and last updated on 2026-06-17.

CVE-2020-15148

CVE-2020-15148 is a high-severity vulnerability in Yiiframework Yii with a CVSS 3.x base score of 8.9. Its EPSS exploit-prediction score of 79% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 8.9)
CVSS v2: 7.5
EPSS exploit prediction: 79% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Yiiframework Yii
Published: 2020-09-15
Last modified: 2026-06-17

Description

Yii 2 (yiisoft/yii2) before version 2.0.38 is vulnerable to remote code execution if the application calls `unserialize()` on arbitrary user input. This is fixed in version 2.0.38. A possible workaround without upgrading is available in the linked advisory.

Frequently asked questions

What is CVE-2020-15148?: Yii 2 (yiisoft/yii2) before version 2.0.38 is vulnerable to remote code execution if the application calls `unserialize()` on arbitrary user input. This is fixed in version 2.0.38. A possible workaround without upgrading is available in the linked advisory.
How severe is CVE-2020-15148?: CVE-2020-15148 has a CVSS 3.x base score of 8.9, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2020-15148 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 79% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15148?: CVE-2020-15148 affects Yiiframework Yii. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15148?: 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-2020-15148 published?: CVE-2020-15148 was published on 2020-09-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yiiframework:yii:*:*:*:*:*:*:*:*

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