CVEvulnerability

CVE-2020-1917

9.8 CRITICAL Published 2021-03-10 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-03-10
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-122, CWE-787

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.

Affected configurations

• facebook hhvm (< 4.56.3) • facebook hhvm (>= 4.57.0 < 4.80.2) • facebook hhvm (>= 4.81.0 < 4.93.2) • facebook hhvm 4.94.0 • facebook hhvm 4.95.0 • facebook hhvm 4.96.0 • facebook hhvm 4.97.0 • facebook hhvm 4.98.0

Related

Weakness · CWE (2)

  • CWE-122 Heap-based Buffer Overflow weakness
  • CWE-787 Out-of-bounds Write weakness

References