How severe is CVE-2025-27520?

CVE-2025-27520 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-2025-27520 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 36% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27520?

CVE-2025-27520 affects Bentoml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27520?

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.

Does CVE-2025-27520 have an EU (EUVD) identifier?

Yes. CVE-2025-27520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9752.

When was CVE-2025-27520 published?

CVE-2025-27520 was published on 2025-04-04 and last updated on 2026-06-17.

CVE-2025-27520

CVE-2025-27520 is a critical-severity vulnerability in Bentoml with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 36% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 36% (98th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-9752
Weakness: CWE-502
Affected product: Bentoml
Published: 2025-04-04
Last modified: 2026-06-17

Description

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. A Remote Code Execution (RCE) vulnerability caused by insecure deserialization has been identified in the latest version (v1.4.2) of BentoML. It allows any unauthenticated user to execute arbitrary code on the server. It exists an unsafe code segment in serde.py. This vulnerability is fixed in 1.4.3.

Frequently asked questions

What is CVE-2025-27520?: BentoML is a Python library for building online serving systems optimized for AI apps and model inference. A Remote Code Execution (RCE) vulnerability caused by insecure deserialization has been identified in the latest version (v1.4.2) of BentoML. It allows any unauthenticated user to execute arbitrary code on the server. It exists an unsafe code segment in serde.py. This vulnerability is fixed in 1.4.3.
How severe is CVE-2025-27520?: CVE-2025-27520 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-2025-27520 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 36% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27520?: CVE-2025-27520 affects Bentoml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27520?: 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.
Does CVE-2025-27520 have an EU (EUVD) identifier?: Yes. CVE-2025-27520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9752.
When was CVE-2025-27520 published?: CVE-2025-27520 was published on 2025-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bentoml:bentoml:*:*:*:*:*:*:*:*

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