Buffer overflow in Facebook Hhvm
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. 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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.040 (90.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.040 · newest: 0.040 · change: 0.000
Affected products
- Facebook Hhvm — versions 4.20.0, unspecified, 4.19.0
Weakness classification (CWE)
References
- github.com/facebook/hhvm/commit/dbeb9a56a638e3fdcef8b691c2a2967132dae692 (Patch, Third Party Advisory)
- hhvm.com/blog/2019/09/25/security-update.html (Vendor Advisory)
- www.facebook.com/security/advisories/cve-2019-11929 (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-11929?
- CVE-2019-11929 is a critical-severity vulnerability in Facebook Hhvm, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2019-10-02.
- How severe is CVE-2019-11929?
- Critical severity. CVSS v3 base score is 9.8 out of 10.