VDB-97109 · CVE-2016-6875 · Nessus 264212

Facebook HHVM up to 3.14.x WDDX recursion

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.
7.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Facebook HHVM up to 3.14.x. It has been classified as problematic. Affected by this issue is some unknown functionality of the component WDDX. The manipulation leads to recursion. This vulnerability is traded as CVE-2016-6875. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Facebook HHVM up to 3.14.x (Social Network Software). It has been rated as problematic. This issue affects an unknown code block of the component WDDX. The manipulation with an unknown input leads to a recursion vulnerability. Using CWE to declare the problem leads to CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. Impacted is availability. The summary by CVE is:

Infinite recursion in wddx in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors.

The bug was discovered 08/11/2016. The weakness was shared 02/17/2017 (oss-sec). The advisory is shared at openwall.com. The identification of this vulnerability is CVE-2016-6875 since 08/18/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 190 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 264212 (Linux Distros Unpatched Vulnerability : CVE-2016-6875), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.15.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (264212). The entries VDB-97104, VDB-97105, VDB-97106 and VDB-97107 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Social Network Software

Name

Facebook HHVM

Version

License

free

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Recursion
CWE: CWE-674 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 264212
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2016-6875

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Facebook HHVM 3.15.0

Timelineinfo

08/11/2016 🔍
08/18/2016 +7 days 🔍
02/17/2017 +183 days 🔍
02/17/2017 +0 days 🔍
02/18/2017 +1 days 🔍
09/13/2025 +3129 days 🔍

Sourcesinfo

Advisory: openwall.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-6875 (🔍)
GCVE (CVE): GCVE-0-2016-6875
GCVE (VulDB): GCVE-100-97109
OSVDB: - CVE-2016-6875 - Facebook - HHVM - Infinite Recursion Issue

See also: 🔍

Entryinfo

Created: 02/18/2017 09:00
Updated: 09/13/2025 23:45
Changes: 02/18/2017 09:00 (60), 08/15/2020 21:13 (2), 09/13/2025 23:45 (21)
Complete: 🔍
Cache ID: 216:5C3:103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.