CVE-2020-1917
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Facebook Hhvm
PublishedMar 10, 2021
First seenMar 10, 2021
Weakness typeCWE-122CWE-122
How to fix
Update
- facebook hhvm4.56.3, 4.80.2, 4.93.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| facebook hhvm | v < 4.56.3, 4.57.0 ≤ v < 4.80.2, 4.81.0 ≤ v < 4.93.2, 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0 | 4.56.3, 4.80.2, 4.93.2 |
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