CVE-2020-1917: Facebook Hhvm

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

xbuf_format_converter, used as part of exif_read_data, was appending a terminating null character to the generated string, but was not using its standard append char function. As a result, if the buffer was full, it would result in an out-of-bounds write. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.

Affected products

• Facebook Hhvm: before 4.56.3 (fixed in 4.56.3); from 4.57.0, before 4.80.2 (fixed in 4.80.2); from 4.81.0, before 4.93.2 (fixed in 4.93.2); version 4.94.0 only; version 4.95.0 only; version 4.96.0 only; …

Published 2021-03-10. Last modified 2026-06-17.