How severe is CVE-2019-11924?

CVE-2019-11924 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-2019-11924 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-2019-11924?

CVE-2019-11924 affects Facebook Fizz. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-11924?

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-2019-11924 published?

CVE-2019-11924 was published on 2019-08-20 and last updated on 2026-06-17.

CVE-2019-11924

CVE-2019-11924 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-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Facebook Fizz
Published: 2019-08-20
Last modified: 2026-06-17

Description

A peer could send empty handshake fragments containing only padding which would be kept in memory until a full handshake was received, resulting in memory exhaustion. This issue affects versions v2019.01.28.00 and above of fizz, until v2019.08.05.00.

Frequently asked questions

What is CVE-2019-11924?: A peer could send empty handshake fragments containing only padding which would be kept in memory until a full handshake was received, resulting in memory exhaustion. This issue affects versions v2019.01.28.00 and above of fizz, until v2019.08.05.00.
How severe is CVE-2019-11924?: CVE-2019-11924 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-2019-11924 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-2019-11924?: CVE-2019-11924 affects Facebook Fizz. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-11924?: 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-2019-11924 published?: CVE-2019-11924 was published on 2019-08-20 and last updated on 2026-06-17.

References

Affected products (1)

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

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