HHVM up to 3.21.7/3.24.3 Proxygen data processing

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8$0-$5k0.00

Summaryinfo

A vulnerability has been found in HHVM up to 3.21.7/3.24.3 and classified as problematic. The impacted element is an unknown function of the component Proxygen. Performing a manipulation results in data processing. This vulnerability is identified as CVE-2018-6332. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in HHVM up to 3.21.7/3.24.3. This affects an unknown part of the component Proxygen. The manipulation with an unknown input leads to a data processing vulnerability. CWE is classifying the issue as CWE-19. This is going to have an impact on availability. The summary by CVE is:

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.

The bug was discovered 03/15/2018. The weakness was released 12/03/2018 (Website). It is possible to read the advisory at hhvm.com. This vulnerability is uniquely identified as CVE-2018-6332 since 01/26/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 263 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Data processing
CWE: CWE-19
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/26/2018 🔍
03/15/2018 +48 days 🔍
12/03/2018 +263 days 🔍
12/03/2018 +0 days 🔍
12/04/2018 +1 days 🔍
05/06/2025 +2345 days 🔍

Sourcesinfo

Advisory: hhvm.com
Status: Not defined

CVE: CVE-2018-6332 (🔍)
GCVE (CVE): GCVE-0-2018-6332
GCVE (VulDB): GCVE-100-127431

Entryinfo

Created: 12/04/2018 09:40
Updated: 05/06/2025 21:48
Changes: 12/04/2018 09:40 (55), 04/17/2020 08:06 (1), 05/06/2025 21:48 (16)
Complete: 🔍
Cache ID: 216::103

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