How severe is CVE-2019-18960?

CVE-2019-18960 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-2019-18960 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18960?

CVE-2019-18960 primarily affects Amazon Firecracker. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18960?

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-2019-18960 published?

CVE-2019-18960 was published on 2019-12-11 and last updated on 2026-06-17.

CVE-2019-18960

CVE-2019-18960 is a critical-severity vulnerability in Amazon Firecracker 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Amazon Firecracker
Published: 2019-12-11
Last modified: 2026-06-17

Description

Firecracker vsock implementation buffer overflow in versions 0.18.0 and 0.19.0. This can result in potentially exploitable crashes.

Frequently asked questions

What is CVE-2019-18960?: Firecracker vsock implementation buffer overflow in versions 0.18.0 and 0.19.0. This can result in potentially exploitable crashes.
How severe is CVE-2019-18960?: CVE-2019-18960 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-2019-18960 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18960?: CVE-2019-18960 primarily affects Amazon Firecracker. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18960?: 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-2019-18960 published?: CVE-2019-18960 was published on 2019-12-11 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:amazon:firecracker:0.18.0:*:*:*:*:*:*:*
cpe:2.3:a:amazon:firecracker:0.19.0:*:*:*:*:*:*:*

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