CVE-2020-1917
highpriority · track · 39EPSS 0.014 · 72 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8
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
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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-2020-1917cnnvd
- 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.htmlRelease NotesVendor Advisorynvd
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