CVE-2020-1918
In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory…
- Published
- Updated
- Reserved
- Assigned by
Description
In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer. 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.
Timeline
ID reserved
By facebook
- 15 months later
· 15 months later
Published
- 3 years later
· 3 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 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 1.2% · top 31% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
- unaffected 4.98.1 – < unspecified
- affected 4.98.0
- unaffected 4.97.1 – < unspecified
- affected 4.97.0
- unaffected 4.96.1 – < unspecified
- affected 4.96.0
- unaffected 4.95.1 – < unspecified
- affected 4.95.0
- unaffected 4.94.1 – < unspecified
- affected 4.94.0
- unaffected 4.93.2 – < unspecified
- affected 4.81.0 – < unspecified
- unaffected 4.80.2 – < unspecified
- affected 4.57.0 – < unspecified
- unaffected 4.56.3 – < unspecified
- affected unspecified – < 4.56.3
References (2)
- https://hhvm.com/blog/2021/02/25/security-update.html (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca (opens in a new tab)x_refsource_MISCx_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)
- 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://trackcve.app/cve/CVE-2020-1918)Record last updated .