{"id":"CVE-2016-7153","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-7153","generatedAt":"2026-10-28T21:51:47.591Z","title":"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…","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.","published":"2016-09-06T10:59:01.000Z","lastModified":"2026-06-17T00:52:42.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"cwe":["CWE-200"],"affected":["microsoft/edge","microsoft/internet explorer","google/chrome","apple/safari","opera/opera browser","mozilla/firefox"],"epss":{"score":0.12766,"percentile":0.96254,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.15772,"percentile":0.96773},{"date":"2026-09-22","score":0.13983,"percentile":0.9638},{"date":"2026-10-14","score":0.12766,"percentile":0.96225}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"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."},"changes":[],"references":[{"url":"http://arstechnica.com/security/2016/08/new-attack-steals-ssns-e-mail-addresses-and-more-from-https-pages/","tags":["Technical Description"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/92773","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1036741","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1036742","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1036743","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1036744","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1036745","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1036746","source":"cve@mitre.org"},{"url":"https://tom.vg/papers/heist_blackhat2016.pdf","tags":["Technical Description"],"source":"cve@mitre.org"},{"url":"http://arstechnica.com/security/2016/08/new-attack-steals-ssns-e-mail-addresses-and-more-from-https-pages/","tags":["Technical Description"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/92773","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1036741","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1036742","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1036743","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1036744","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1036745","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1036746","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://tom.vg/papers/heist_blackhat2016.pdf","tags":["Technical Description"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-7153","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}