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Fencer Vulns
medium 5.3

CVE-2016-7153 json

The HTTP/2 protocol does not consider the role of the TCP congestion window in providing information about content length, which makes it e…

published 2016-09-06 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-8021

cvss
5.3
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
12.8%
EPSS 12.8% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

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.

Patch / fix

  • apple safari 8
  • google chrome 67
  • microsoft edge 79
  • mozilla firefox 103
  • opera opera_browser 55

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-7153 updated cvss 3.1

HTTP/2: HEIST attack allows attackers to sniff TLS encrypted HTTP/2 traffic

  • Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

12.77% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: vendors marked as obsolete many years ago.