Opera Web Browser HTTP/2 HEIST information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Opera Web Browser. This vulnerability affects unknown code of the component HTTP/2 Handler. This manipulation causes information disclosure (HEIST). This vulnerability appears as CVE-2016-7153. The attack may be initiated remotely. There is no available exploit. Due to its background and reception, this vulnerability has an historic impact. It is recommended to apply the suggested workaround.

Detailsinfo

A vulnerability was found in Opera Web Browser (Web Browser) (affected version not known). It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component HTTP/2 Handler. The manipulation with an unknown input leads to a information disclosure vulnerability (HEIST). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

The HTTP/2 protocol does not consider the role of the TCP congestion window in providing information about content length, which makes it easier for remote attackers to obtain cleartext data by leveraging a web-browser configuration in which third-party cookies are sent, aka a "HEIST" attack.

The weakness was presented 08/03/2016 by Mathy Vanhoef and Tom Van Goethem with iMinds-DistriNet as HEIST: HTTP Encrypted Information can be Stolen through TCP-windows as confirmed paper (Blackhat). It is possible to read the advisory at blackhat.com. The vendor was not involved in the public release. This vulnerability is known as CVE-2016-7153 since 09/06/2016. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/08/2025). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK. Due to its background and reception, this vulnerability has a historic impact.

The vulnerability scanner Nessus provides a plugin with the ID 261316 (Linux Distros Unpatched Vulnerability : CVE-2016-7153), which helps to determine the existence of the flaw in a target environment.

The best possible mitigation is suggested to be Workaround.

The vulnerability is also documented in the databases at Tenable (261316) and SecurityFocus (BID 92773†). Additional details are provided at arstechnica.com. See VDB-91292, VDB-91293, VDB-91294 and VDB-91295 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: HEIST
Class: Information disclosure / HEIST
CWE: CWE-200 / CWE-284 / CWE-266
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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Nessus ID: 261316
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2016-7153

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Workaround
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/03/2016 🔍
09/06/2016 +33 days 🔍
09/06/2016 +0 days 🔍
09/06/2016 +0 days 🔍
09/07/2016 +1 days 🔍
09/08/2025 +3288 days 🔍

Sourcesinfo

Vendor: opera.com

Advisory: HEIST: HTTP Encrypted Information can be Stolen through TCP-windows
Researcher: Mathy Vanhoef, Tom Van Goethem
Organization: iMinds-DistriNet
Status: Confirmed

CVE: CVE-2016-7153 (🔍)
GCVE (CVE): GCVE-0-2016-7153
GCVE (VulDB): GCVE-100-91303
SecurityFocus: 92773 - HTTP/2 CVE-2016-7153 Information Disclosure Vulnerability
SecurityTracker: 1036741

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 09/07/2016 11:07
Updated: 09/08/2025 20:35
Changes: 09/07/2016 11:07 (53), 04/22/2019 10:53 (9), 09/15/2022 08:22 (2), 09/08/2025 20:35 (16)
Complete: 🔍
Cache ID: 216::103

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