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CVE-2016-7152

20
FAUCET Score

CVE-2016-7152 describes a vulnerability in the HTTPS protocol that allows remote attackers to infer content length by observing TCP congestion window behavior, facilitating a "HEIST" attack. This flaw, affecting products from Apple, Google, Microsoft, Mozilla, and Opera, enables the extraction of cleartext data when third-party cookies are sent from a web browser. With a CVSS score of 5.3 (MEDIUM), it has a low impact on confidentiality and requires no user interaction or privileges to exploit. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:opera:opera:-:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:internet_explorer:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
13.98%
Probability of exploitation in next 30 days
EPSS Percentile
96.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1398 is in the 96th percentile among its peer group of 23,701 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2016-7152Low

HTTPS: HEIST attack allows attackers to sniff TLS encrypted HTTP traffic

Aug 3, 2016

References

arstechnica.com / security/2016/08/new-attack-steals-ssns-e-mail-addresses-and-more-from-https-pages
Technical Description
tom.vg / papers/heist_blackhat2016.pdf
Technical Description
securityfocus.com / bid/92769
securitytracker.com / id/1036741
securitytracker.com / id/1036742
securitytracker.com / id/1036743
securitytracker.com / id/1036744
securitytracker.com / id/1036745
securitytracker.com / id/1036746