CVE-2020-1892Insufficient boundary checks when decoding JSON in JSON_parser allows read access to out of bounds memory, potentially leading to…
- 8.1HighCVSS base score
- 1.1%Exploitation in 30 daysEPSS · top 34% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Insufficient boundary checks when decoding JSON in JSON_parser allows read access to out of bounds memory, potentially leading to information leak and DOS. This issue affects HHVM 4.45.0, 4.44.0, 4.43.0, 4.42.0, 4.41.0, 4.40.0, 4.39.0, versions between 4.33.0 and 4.38.0 (inclusive), versions between 4.9.0 and 4.32.0 (inclusive), and versions prior to 4.8.7.
Timeline
ID reserved
By facebook
- 3 months later
· 3 months later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.1% · top 34% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Affected products
- affected 4.45.1
- affected 4.45.0
- affected 4.44.1
- affected 4.44.0
- affected 4.43.1
- affected 4.43.0
- affected 4.42.1
- affected 4.42.0
- affected 4.41.1
- affected 4.41.0
- affected 4.40.1
- affected 4.40.0
- affected 4.39.1
- affected 4.39.0
- affected 4.38.1
- affected 4.33.0 – < unspecified
- affected 4.32.1
- affected 4.9.0 – < unspecified
- affected 4.8.7
- affected unspecified – ≤ 4.8.6
References
References2
- https://hhvm.com/blog/2020/02/20/security-update.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/facebook/hhvm/commit/dabd48caf74995e605f1700344f1ff4a5d83441d (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2020-12718 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2020-1892)Record last updated .