How severe is CVE-2020-29312?

CVE-2020-29312 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-2020-29312 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-29312?

CVE-2020-29312 affects Zend Zend Framework. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-29312?

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-2020-29312 published?

CVE-2020-29312 was published on 2023-04-04 and last updated on 2026-07-05.

CVE-2020-29312

CVE-2020-29312 is a critical-severity vulnerability in Zend Zend Framework with a CVSS 3.x base score of 9.8. 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Zend Zend Framework
Published: 2023-04-04
Last modified: 2026-07-05

Description

An issue found in Zend Framework v.3.1.3 and before allow a remote attacker to execute arbitrary code via the unserialize function. Note: This has been disputed by third parties as incomplete and incorrect. The framework does not have a version that surpasses 2.x.x and was deprecated in early 2020.

Frequently asked questions

What is CVE-2020-29312?: An issue found in Zend Framework v.3.1.3 and before allow a remote attacker to execute arbitrary code via the unserialize function. Note: This has been disputed by third parties as incomplete and incorrect. The framework does not have a version that surpasses 2.x.x and was deprecated in early 2020.
How severe is CVE-2020-29312?: CVE-2020-29312 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-2020-29312 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-29312?: CVE-2020-29312 affects Zend Zend Framework. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-29312?: 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-2020-29312 published?: CVE-2020-29312 was published on 2023-04-04 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:zend:zend_framework:*:*:*:*:*:*:*:*

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