Buffer overflow in Facebook Hhvm
CVE-2020-1916
An incorrect size calculation in ldap_escape may lead to an integer overflow when overly long input is passed in, resulting in an out-of-bounds write. This issue affects HHVM prior to 4.56.2, all versions between 4.57.0 and 4.78.0, 4.79.0, 4.80.0, 4.81.0, 4.82.0, 4.83.0.
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: 0.014 (71.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Facebook Hhvm — versions 4.83.1, 4.83.0, 4.82.1
Weakness classification (CWE)
References
- hhvm.com/blog/2020/11/12/security-update.html (Release Notes, Vendor Advisory)
- github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1916?
- CVE-2020-1916 is a critical-severity vulnerability in Facebook Hhvm, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-03-10.
- How severe is CVE-2020-1916?
- Critical severity. CVSS v3 base score is 9.8 out of 10.