CVE-2020-1919 json
Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument passed in is longer tha…
published 2021-03-10 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-12740
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument passed in is longer than the first. 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.
Patch / fix
Exploit prediction
1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- Facebook HHVM
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
github.com
/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca
patch, third-party-advisory
-
hhvm.com
/blog/2021/02/25/security-update.html
release-notes, vendor-advisory
Sources
- CVE List CVE-2020-1919
- NVD CVE-2020-1919
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.