How severe is CVE-2019-3560?

CVE-2019-3560 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-3560 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-3560?

CVE-2019-3560 affects Facebook Fizz. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-3560?

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-2019-3560 published?

CVE-2019-3560 was published on 2019-04-29 and last updated on 2026-06-17.

CVE-2019-3560

CVE-2019-3560 is a high-severity vulnerability in Facebook Fizz with a CVSS 3.x base score of 7.5. 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-131.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-131
Affected product: Facebook Fizz
Published: 2019-04-29
Last modified: 2026-06-17

Description

An improperly performed length calculation on a buffer in PlaintextRecordLayer could lead to an infinite loop and denial-of-service based on user input. This issue affected versions of fizz prior to v2019.03.04.00.

Frequently asked questions

What is CVE-2019-3560?: An improperly performed length calculation on a buffer in PlaintextRecordLayer could lead to an infinite loop and denial-of-service based on user input. This issue affected versions of fizz prior to v2019.03.04.00.
How severe is CVE-2019-3560?: CVE-2019-3560 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-3560 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-3560?: CVE-2019-3560 affects Facebook Fizz. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-3560?: 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-2019-3560 published?: CVE-2019-3560 was published on 2019-04-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:facebook:fizz:*:*:*:*:*:*:*:*

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