CVE-2020-1921
mediumpriority · track · 30EPSS 0.012 · 68 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (16)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44cacnnvd
- https://hhvm.com/blog/2021/02/25/security-update.htmlcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2020-1921cnnvd
- https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44caenisa_euvd
- https://hhvm.com/blog/2021/02/25/security-update.htmlenisa_euvd
- https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44caPatchThird Party Advisorynvd
- https://hhvm.com/blog/2021/02/25/security-update.htmlVendor Advisorynvd
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