CVE-2019-11921 json
An out of bounds write is possible via a specially crafted packet in certain configurations of Proxygen due to improper handling of Base64…
published 2019-07-25 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3579
- cvss
- 9.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.1%
- EPSS 2.1% chance of exploitation in 30 days, percentile 81%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
2.08% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Facebook Proxygen
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
github.com
/facebook/proxygen/commit/2f07985bef9fbae124cc63e5c0272e32da4fdaec
patch, third-party-advisory
-
facebook.com
/security/advisories/cve-2019-11921
third-party-advisory
Sources
- CVE List CVE-2019-11921
- NVD CVE-2019-11921
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.