Out-of-bounds Read in Facebook Hhvm
CVE-2019-11935
Insufficient boundary checks when processing a string in mb_ereg_replace allows access to out-of-bounds memory. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, as well as 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1.
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: 0.015 (73.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Facebook Hhvm — versions unspecified, 4.24.0, 4.28.2
Weakness classification (CWE)
References
- hhvm.com/blog/2019/10/28/security-update.html (Vendor Advisory)
- github.com/facebook/hhvm/commit/1c518555dba6ceb45d5ba61845b96e261219c3b7 (Patch, Third Party Advisory)
- www.facebook.com/security/advisories/cve-2019-11935 (Vendor Advisory)
Frequently asked questions
- What is CVE-2019-11935?
- CVE-2019-11935 is a critical-severity vulnerability in Facebook Hhvm, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2019-12-04.
- How severe is CVE-2019-11935?
- Critical severity. CVSS v3 base score is 9.8 out of 10.