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Vulnerability record · CVE-2016-7153 · published 6 September 2016

CVE-2016-7153: Microsoft edge information exposure vulnerability

Microsoft · Edge

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.

5.3 CVSS 3.0 Medium EPSS 14% · top 3.6% CWE-200 · Information exposure
5.3CVSS 3.0 base score, v2 5.0
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

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.

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

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://arstechnica.com/security/2016/08/new-attack-steals-ssns-e-mail-addresses-and-more-from-https-pages/ Technical Description
http://www.securityfocus.com/bid/92773
http://www.securitytracker.com/id/1036741
http://www.securitytracker.com/id/1036742
http://www.securitytracker.com/id/1036743
http://www.securitytracker.com/id/1036744
http://www.securitytracker.com/id/1036745
http://www.securitytracker.com/id/1036746
https://tom.vg/papers/heist_blackhat2016.pdf Technical Description
http://arstechnica.com/security/2016/08/new-attack-steals-ssns-e-mail-addresses-and-more-from-https-pages/ Technical Description
http://www.securityfocus.com/bid/92773
http://www.securitytracker.com/id/1036741
http://www.securitytracker.com/id/1036742
http://www.securitytracker.com/id/1036743
http://www.securitytracker.com/id/1036744
http://www.securitytracker.com/id/1036745
http://www.securitytracker.com/id/1036746
https://tom.vg/papers/heist_blackhat2016.pdf Technical Description

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-7153), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.