CVE-2019-3557
9.8 · CRITICALOverview
CVE-2019-3557 is a critical-severity vulnerability affecting facebook hhvm. It was published on January 15, 2019 and has a CVSS 3.0 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
The implementations of streams for bz2 and php://output improperly implemented their readImpl functions, returning -1 consistently. This behavior caused some stream functions, such as stream_get_line, to trigger an out-of-bounds read when operating on such malformed streams. The implementations were updated to return valid values consistently. This affects all supported versions of HHVM (3.30 and 3.27.4 and below).
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 | Affected |
Frequently Asked Questions
What is CVE-2019-3557?
CVE-2019-3557 is a critical-severity vulnerability affecting facebook hhvm. It was published on January 15, 2019 and has a CVSS 3.0 base score of 9.8 (CRITICAL).
How severe is CVE-2019-3557?
This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2019-3557?
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-2019-3557?
CyberStrike's AI-powered security agents can automatically detect CVE-2019-3557 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
AI agents map your attack surface to find vulnerabilities like this one.
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