CVE-2020-1918 - CVE House
Back to Database
Status published High CVE-2020-1918

In-memory file operations (ie: using fopen on a data URI)...

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2020-1918

Credits & Attribution

No credits recorded in the NVD database.

References

More from Facebook

View All →
CVE-2025-64296
WordPress Facebook for WooCommerce plugin <= 3.5.7 - Broken Access Control to Notice Dismissal vulnerability
Medium 5.3
CVE-2025-55181
Sending an HTTP request/response body with greater than 2^31 bytes...
Medium 5.3
CVE-2025-55179
Incomplete validation of rich response messages in WhatsApp for iOS...
Medium 5.4
CVE-2025-55177
Incomplete authorization of linked device synchronization messages in WhatsApp for...
Medium 5.4
CVE-2025-30403
A heap-buffer-overflow vulnerability is possible in mvfst via a specially...
Unknown 0

Affected Vendor

Affected Software

HHVM
Vulnerable Versions:
4.98.1, 4.98.0, 4.97.1, 4.97.0, 4.96.1, 4.96.0, 4.95.1, 4.95.0, 4.94.1, 4.94.0, 4.93.2, 4.81.0, 4.80.2, 4.57.0, 4.56.3, unspecified

Timeline

Official Publish: March 10th, 2021
Last Modified: August 4th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-127

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.