CVE-2018-6335 : A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to

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.

Published 2018-12-31 19:29:00

Updated 2019-10-09 23:41:46

Source Facebook, Inc.

View at NVD, CVE.org

Vulnerability category: Input validationDenial of service

Threat overview for CVE-2018-6335

Top countries where our scanners detected CVE-2018-6335

Top open port discovered on systems with this issue 80

IPs affected by CVE-2018-6335 174

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2018-6335!

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Exploit prediction scoring system (EPSS) score for CVE-2018-6335

EPSS FAQ

0.11%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 44 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2018-6335

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
7.5	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2018-6335

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Assigned by: nvd@nist.gov (Primary)

CWE-400 Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

Assigned by: cve-assign@fb.com (Secondary)

References for CVE-2018-6335

https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56

[security][CVE-2018-6335] Fix potential crash in HTTP2 padding handling · facebook/hhvm@4cb57dd · GitHub
Patch;Third Party Advisory
https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.html

HHVM 3.25.3, HHVM 3.24.7, and 3.21.11 | HHVM
Vendor Advisory

Products affected by CVE-2018-6335