CVE-2016-7153: n/a vulnerability

CVE-2016-7153: The HTTP/2 protocol does not consider the role of the TCP congestion window in providing information about...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 01:50 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2016-7153 describes the HEIST attack: a weakness in how HTTP/2 over TCP can leak information about encrypted web responses. It can help an attacker infer sensitive cleartext data from HTTPS pages when a victim browser sends third-party cookies. The bundle does not identify specific affected products or a universal patch. Exposure is most relevant to sites serving sensitive authenticated content over HTTP/2 where cross-site requests include third-party cookies. The source bundle lists affected vendor and product as n/a, so product-specific exposure must be confirmed from local architecture and vendor guidance. Treat this as a targeted privacy and data exposure concern, not an emergency wormable server flaw. Prioritize review for high-value authenticated applications that depend on third-party cookies or expose sensitive user data through HTTP/2 responses. Mitigation focus: Check current browser, server, CDN, and framework guidance for HEIST-related mitigations.; Restrict third-party cookie use where business-compatible.; Reduce sensitive data variation in cross-origin authenticated responses..

Prepared: Jun 13, 2026, 13:39 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Sep 6, 2016, 10:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://tom.vg/papers/heist_blackhat2016.pdfCVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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