CVE-2016-7153
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…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 12.8%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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
- 5.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 12.77% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- microsoft/edge · microsoft/internet explorer · google/chrome · apple/safari · opera/opera browser · mozilla/firefox
- Source
- cve@mitre.org
EPSS moved from 15.8% on 21 September 2026 to 12.8% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- 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.pdfTechnical 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.pdfTechnical Description
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.