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Case File

CVE-2019-3557

CRITICAL · CVSS 9.8 EPSS 1.71% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2019-01-15 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2019-3557
Severity
CRITICAL
CVSS
9.8
EPSS
1.71%

Original NVD 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).