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Critical severity9.8NVD Advisory· Published Mar 10, 2021· Updated Jun 17, 2026

CVE-2020-1917

CVE-2020-1917

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

8
  • Facebook/Hhvm7 versions
    cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*+ 6 more
    • cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*range: <4.56.3
    • cpe:2.3:a:facebook:hhvm:4.94.0:*:*:*:*:*:*:*
    • cpe:2.3:a:facebook:hhvm:4.95.0:*:*:*:*:*:*:*
    • cpe:2.3:a:facebook:hhvm:4.96.0:*:*:*:*:*:*:*
    • cpe:2.3:a:facebook:hhvm:4.97.0:*:*:*:*:*:*:*
    • cpe:2.3:a:facebook:hhvm:4.98.0:*:*:*:*:*:*:*
    • (no CPE)range: 4.98.0
  • HHVM/HHVMllm-fuzzy
    Range: <4.56.3, 4.57.0-4.80.1, 4.81.0-4.93.1, 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0

Patches

Vulnerability mechanics

References

2

News mentions

0

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