CVE Feed

    Dashboard / CVE / CVE-2018-6332

    CVE-2018-6332

    A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 settings which can cause the server to spend disproportionate resources. This affects all supported versions of HHVM (3.24.3 and 3.21.7 and below) when using the proxygen server to handle HTTP2 requests.

    Published:Dec 3, 2018
    Last Modified:May 6, 2025
    EPS:Dec 3, 2018
    EPSS Score:0.00389
    CVSS Score:5.9

    Affected Products

    Vendor
    Facebook
    Product
    Hhvm

    Exploits

    No exploit reference

    Related CVEs

    CVE-2022-36937 (CVSS 9.8) — HHVM 4.172.0 and all prior versions use TLS 1.0 for secure connections when handling tls:// URLs in the stream…
    CVE-2019-3556 (CVSS 8.1) — HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those reque…
    CVE-2021-24036 (CVSS 9.8) — Passing an attacker controlled size when creating an IOBuf could cause integer overflow, leading to an out of …
    CVE-2020-1900 (CVSS 9.8) — When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic pr…
    CVE-2020-1899 (CVSS 7.5) — The unserialize() function supported a type code, "S", which was meant to be supported only for APC serializat…
    CVE-2020-1898 (CVSS 7.5) — The fb_unserialize function did not impose a depth limit for nested deserialization. That meant a maliciously …
    CVE-2020-1921 (CVSS 7.5) — In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validati…
    CVE-2021-24025 (CVSS 9.8) — Due to incorrect string size calculations inside the preg_quote function, a large input string passed to the f…
    CVE-2020-1919 (CVSS 7.5) — Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string arg…
    CVE-2020-1918 (CVSS 7.5) — In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High