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 cookies are sent, aka a "HEIST" attack.

Published: 2016-09-06 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-7153 is rated Moderate Risk (47.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.25%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-7153

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-01 2.28% 1.25% -1.03%
2 2025-09-16 3.91% 2.28% -1.64%
3 2025-05-10 — 3.91% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-7153

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2016-7153

OS Trackers for CVE-2016-7153

vendor priority summary link
redhat low — https://access.redhat.com/security/cve/CVE-2016-7153
ubuntu low CVE-2016-7153 low priority: Ubuntu including 4 source packages (chromium-browser, firefox, oxide-qt, thunderbird), 24 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): ignored 15, DNE 5, needed 2, needs-triage 2. https://ubuntu.com/security/CVE-2016-7153

Affected software / configurations for CVE-2016-7153

Vendor Product Version Raw CPE
microsoft edge — cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:*
microsoft internet_explorer — cpe:2.3:a:microsoft:internet_explorer:-:*:*:*:*:*:*:*
google chrome — cpe:2.3:a:google:chrome:-:*:*:*:*:*:*:*
apple safari — cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
opera opera_browser — cpe:2.3:a:opera:opera_browser:-:*:*:*:*:*:*:*
mozilla firefox — cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

References for CVE-2016-7153

cvelogic Threat Intelligence