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High severity7.5NVD Advisory· Published Mar 10, 2021· Updated Jun 17, 2026

CVE-2020-1921

CVE-2020-1921

Description

In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the buffer. 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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