High severity · published Dec 31, 2018
CVE-2018-6335
A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data
7.5
CVSS
1.5%
EPSS
No
On KEV
Description
A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to denial-of-service. This affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HH
Hhvm · Facebook
through 3.21.10; 3.24.6; 3.25.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-6335
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-6335
Patch
https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56
Vendor Advisory
https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.html
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