9.8crit
CVE-2020-1900
When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting…
Published 5 y ago · modified 4 mo ago · JSON
CVSS
9.8
v3.1 · NVD
CISA KEV
No
not known exploited
EPSS
1.4%
percentile 72%
Public exploits
0
none known
Summary
When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting anything into it. Otherwise the array might resize, invalidating previously stored references. This pre-reservation was not occurring in HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.
Exploit prediction (EPSS)
1.38% probability of exploitation in the next 30 days, higher than 72% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Facebook HHVM
Classification
- Weakness
- CWE-416 Use After Free
References
- hhvm.com /blog/2020/06/30/security-update.html · x_refsource_CONFIRM, x_transferred
- github.com /facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3 · x_refsource_MISC, x_transferred
Sources
- CVE List: CVE-2020-1900
- NVD: CVE-2020-1900
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