How severe is CVE-2021-30045?

CVE-2021-30045 has a CVSS 3.x base score of 9.1, 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 none, and availability high.

Is CVE-2021-30045 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30045?

CVE-2021-30045 affects Serenityos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30045?

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-2021-30045 published?

CVE-2021-30045 was published on 2021-04-06 and last updated on 2026-06-17.

CVE-2021-30045

CVE-2021-30045 is a critical-severity vulnerability in Serenityos with a CVSS 3.x base score of 9.1. 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Serenityos
Published: 2021-04-06
Last modified: 2026-06-17

Description

SerenityOS 2021-03-27 contains a buffer overflow vulnerability in the EndOfCentralDirectory::read() function.

Frequently asked questions

What is CVE-2021-30045?: SerenityOS 2021-03-27 contains a buffer overflow vulnerability in the EndOfCentralDirectory::read() function.
How severe is CVE-2021-30045?: CVE-2021-30045 has a CVSS 3.x base score of 9.1, 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 none, and availability high.
Is CVE-2021-30045 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30045?: CVE-2021-30045 affects Serenityos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30045?: 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-2021-30045 published?: CVE-2021-30045 was published on 2021-04-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:serenityos:serenityos:2021-03-27:*:*:*:*:*:*:*

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