CVE-2020-1921
7.5 · HIGHOverview
CVE-2020-1921 is a high-severity vulnerability affecting facebook hhvm. It was published on March 10, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the 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.
Remediation
Check the references section for vendor advisories and patches from facebook. Update hhvm to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| hhvm | >= 0, < 4.56.3 | Affected |
Frequently Asked Questions
What is CVE-2020-1921?
CVE-2020-1921 is a high-severity vulnerability affecting facebook hhvm. It was published on March 10, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2020-1921?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2020-1921?
Check the references section for vendor advisories and patches from facebook. Update hhvm to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2020-1921?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-1921 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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