CVE-2019-11929
Insufficient boundary checks when formatting numbers in number_format allows read/write access to out-of-bounds memory, potentially leading to remote code execution.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.03%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Insufficient boundary checks when formatting numbers in number_format allows read/write access to out-of-bounds memory, potentially leading to remote code execution. This issue affects HHVM versions prior to 3.30.10, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.18.2, and versions 4.19.0, 4.19.1, 4.20.0, 4.20.1, 4.20.2, 4.21.0, 4.22.0, 4.23.0.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.03% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- facebook/hhvm
- Source
- cve-assign@fb.com
EPSS 4.0% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/facebook/hhvm/commit/dbeb9a56a638e3fdcef8b691c2a2967132dae692Patch, Third Party Advisory
- https://hhvm.com/blog/2019/09/25/security-update.htmlVendor Advisory
- https://www.facebook.com/security/advisories/cve-2019-11929Third Party Advisory
- https://github.com/facebook/hhvm/commit/dbeb9a56a638e3fdcef8b691c2a2967132dae692Patch, Third Party Advisory
- https://hhvm.com/blog/2019/09/25/security-update.htmlVendor Advisory
- https://www.facebook.com/security/advisories/cve-2019-11929Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.