CVE-2019-11921

Name: CVE-2019-11921
Creator: NVD / NIST
Published: 2019-07-25T21:15:11.537+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.08%

Last modified Jun 17, 2026

CVE-2019-11921 is a vulnerability of currently unknown severity. An out of bounds write is possible via a specially crafted packet in certain configurations of Proxygen due to improper handling of Base64 when parsing malformed binary content in Structured HTTP Headers. This issue affects versions of proxygen prior to v2019.07.22.00.. EPSS estimates a 2.08% chance of exploitation in the next 30 days.

Description

An out of bounds write is possible via a specially crafted packet in certain configurations of Proxygen due to improper handling of Base64 when parsing malformed binary content in Structured HTTP Headers. This issue affects versions of proxygen prior to v2019.07.22.00.

Metrics

EPSS Probability

2.08%

79.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Facebook	Proxygen	< 2019.07.22.00

References

https://github.com/facebook/proxygen/commit/2f07985bef9fbae124cc63e5c0272e32da4fdaecPatch, Third Party Advisory
https://www.facebook.com/security/advisories/cve-2019-11921Third Party Advisory
https://github.com/facebook/proxygen/commit/2f07985bef9fbae124cc63e5c0272e32da4fdaecPatch, Third Party Advisory
https://www.facebook.com/security/advisories/cve-2019-11921Third Party Advisory

Timeline

Published: Jul 25, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11921?

How severe is CVE-2019-11921?

Severity scoring for CVE-2019-11921 is pending analysis. The EPSS model estimates a 2.08% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11921?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-11921?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST