Out-of-bounds Read in Facebook Hhvm
CVE-2019-3557
The implementations of streams for bz2 and php://output improperly implemented their readImpl functions, returning -1 consistently. This behavior caused some stream functions, such as stream_get_line, to trigger an out-of-bounds read when…
Vulnerability class: Buffer Overflow
EPSS: 0.017 (74.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Facebook Hhvm — versions 3.30.1, 3.30.0, 3.27.5
Weakness classification (CWE)
References
- cve-assign@fb.com (x_refsource_MISC, Vendor Advisory)
- cve-assign@fb.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2019-3557?
- CVE-2019-3557 is a critical-severity vulnerability in Facebook Hhvm, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2019-01-15.
- How severe is CVE-2019-3557?
- Critical severity. CVSS v3 base score is 9.8 out of 10.