Buffer overflow in Facebook Hhvm
CVE-2020-1899
The unserialize() function supported a type code, "S", which was meant to be supported only for APC serialization. This type code allowed arbitrary memory addresses to be accessed as if they were static StringData objects. This issue affected 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.012 (67.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Facebook Hhvm — versions 4.58.2, 4.60.1, unspecified
Weakness classification (CWE)
References
- hhvm.com/blog/2020/06/30/security-update.html (Vendor Advisory)
- github.com/facebook/hhvm/commit/1107228a5128d3ca1c4add8ac1635d933cbbe2e9 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1899?
- CVE-2020-1899 is a high-severity vulnerability in Facebook Hhvm, classified under Untrusted Pointer Dereference. CVSS score: 7.5/10. Published 2021-03-11.
- How severe is CVE-2020-1899?
- High severity. CVSS v3 base score is 7.5 out of 10.