CVE-2016-7153

Summary

CVE	CVE-2016-7153
State	PUBLISHED
Assigner	mitre
Source Priority	CVE Program / NVD first with legacy fallback
Published	2016-09-06 10:59:01 UTC
Updated	2026-05-06 22:30:45 UTC
Description	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.

Risk And Classification

Primary CVSS: v3.0 5.3 MEDIUM from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.012530000 probability, percentile 0.794930000 (date 2026-05-12)

Problem Types: CWE-200 | n/a

Version	Source	Type	Score	Severity	Vector
3.0	[email protected]	Primary	5.3	MEDIUM	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`
2.0	[email protected]	Primary	5		`AV:N/AC:L/Au:N/C:P/I:N/A:N`

CVSS v3.0 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v2.0 Breakdown

Access Vector

Network

Access Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

AV:N/AC:L/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Apple	Safari	All	All	All	All
Application	Google	Chrome	-	All	All	All
Application	Microsoft	Edge	-	All	All	All
Application	Microsoft	Internet Explorer	-	All	All	All
Application	Mozilla	Firefox	All	All	All	All
Application	Opera	Opera Browser	-	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Na	N/a	affected n/a	Not specified

References

Reference	Source	Link	Tags
Microsoft Internet Explorer HTTPS API Attack Against TCP Congestion Window Protocol Lets Remote Users Obtain Potentially Sensitive Information on the Target System - SecurityTracker	af854a3a-2127-422b-91ae-364da2661108	www.securitytracker.com
New attack steals SSNs, e-mail addresses, and more from HTTPS pages \| Ars Technica	af854a3a-2127-422b-91ae-364da2661108	arstechnica.com	Technical Description
Apple Safari HTTPS API Attack Against TCP Congestion Window Protocol Lets Remote Users Obtain Potentially Sensitive Information on the Target System - SecurityTracker	af854a3a-2127-422b-91ae-364da2661108	www.securitytracker.com
Microsoft Edge HTTPS API Attack Against TCP Congestion Window Protocol Lets Remote Users Obtain Potentially Sensitive Information on the Target System - SecurityTracker	af854a3a-2127-422b-91ae-364da2661108	www.securitytracker.com
Mozilla Firefox HTTPS API Attack Against TCP Congestion Window Protocol Lets Remote Users Obtain Potentially Sensitive Information on the Target System - SecurityTracker	af854a3a-2127-422b-91ae-364da2661108	www.securitytracker.com
tom.vg/papers/heist_blackhat2016.pdf	af854a3a-2127-422b-91ae-364da2661108	tom.vg	Technical Description
Opera HTTPS API Attack Against TCP Congestion Window Protocol Lets Remote Users Obtain Potentially Sensitive Information on the Target System - SecurityTracker	af854a3a-2127-422b-91ae-364da2661108	www.securitytracker.com
Google Chrome HTTPS API Attack Against TCP Congestion Window Protocol Lets Remote Users Obtain Potentially Sensitive Information from the Target System in Certain Cases - SecurityTracker	af854a3a-2127-422b-91ae-364da2661108	www.securitytracker.com
HTTP/2 CVE-2016-7153 Information Disclosure Vulnerability	af854a3a-2127-422b-91ae-364da2661108	www.securityfocus.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

There are currently no legacy QID mappings associated with this CVE.